Bringsjord and Licato provide a general meta-argument that cyberwarfare is so different from traditional kinetic warfare that no argument from analogy can allow the just war theory of Augustine and Aquinas to be pulled over from traditional warfare to cyberwarfare. I believe that this meta-argument is sound and that it applies not just to cyberwarfare: in particular, on my reading of the meta-argument, argument from analogy has never been adequate to allow JWT to be applied to the kind of warfare (...) that we are familiar with now. (shrink)

Perry Hendricks’ original impairment argument for the immorality of abortion is based on the impairment principle (TIP): if impairing an organism to some degree is immoral, then ceteris paribus, impairing it to a higher degree is also immoral. Since abortion impairs a fetus to a higher degree than fetal alcohol syndrome (FAS) and giving a fetus FAS is immoral, it follows that abortion is immoral. Critics have argued that the ceteris paribus is not met for FAS and abortion, and so (...) we proposed the Modified Impairment Principle (MIP) to avoid these difficulties. Dustin Crummett has responded, arguing that MIP is open to various counterexamples which show it to be false. He also shows that MIP can generate moral dilemmas. Here, we propose a modification to MIP that resolves the issues Crummett raises. Additionally, Alex Gillham has criticized our appropriation of Don Marquis’ ‘future like ours’ reasoning about the wrongness of impairment. We show that his objections have minimal implications for our argument. (shrink)

Perry Hendricks’ impairment argument for the immorality of abortion is based on two premises: first, impairing a fetus with fetal alcohol syndrome is immoral, and second, if impairing an organism to some degree is immoral, then ceteris paribus, impairing it to a higher degree is also immoral. He calls this the impairment principle. Since abortion impairs a fetus to a higher degree than FAS, it follows from these two premises that abortion is immoral. Critics have focussed on the ceteris paribus (...) clause of TIP, which requires that the relevant details surrounding each impairment be sufficiently similar. In this article, we show that the ceteris paribus clause is superfluous, and by replacing it with a more restrictive condition, the impairment argument is considerably strengthened. There are no data in this work. (shrink)

Rob Lovering has developed an interesting new critique of views that regard embryos as equally valuable as other human beings: the moral argument for frozen human embryo adoption. The argument is aimed at those who believe that the death of a frozen embryo is a very bad thing, and Lovering concludes that some who hold this view ought to prevent one of these deaths by adopting and gestating a frozen embryo. Contra Lovering, we show that there are far more effective (...) strategies for preserving the lives of frozen embryos than adoption. Moreover, we point out that those who regard the deaths of frozen embryos as a very bad thing will generally regard the deaths of all embryos as a very bad thing, whether they are discarded embryos, aborted embryos or embryos that spontaneously abort. This entails these other embryos must be taken into account when considering moral obligations, as well as other human lives at risk from preventable causes. (shrink)

A substantial proportion of human embryos spontaneously abort soon after conception, and ethicists have argued this is problematic for the pro-life view that a human embryo has the same moral status as an adult from conception. Firstly, if human embryos are our moral equals, this entails spontaneous abortion is one of humanity’s most important problems, and it is claimed this is absurd, and a reductio of the moral status claim. Secondly, it is claimed that pro-life advocates do not act as (...) if spontaneous abortion is important, implying they are failing to fulfill their moral obligations. We report that the primary cause of spontaneous abortion is chromosomal defects, which are currently unpreventable, and show that as the other major cause of prenatal death is induced abortion, pro-life advocates can legitimately continue efforts to oppose it. We also defend the relevance of the killing and letting die distinction, which provides further justification for pro-life priorities. (shrink)

It is widely agreed that possession of consciousness contributes to an entity’s moral status, even if it is not necessary for moral status (Levy and Savulescu 2009). An entity is considered to have...

Conscientious objection in healthcare has come under heavy criticism on two grounds recently, particularly regarding abortion provision. First, critics claim conscientious objection involves a refusal to provide a legal and beneficial procedure requested by a patient, denying them access to healthcare. Second, they argue the exercise of conscientious objection is based on unverifiable personal beliefs. These characteristics, it is claimed, disqualify conscientious objection in healthcare. Here, we defend conscientious objection in the context of abortion provision. We show that abortion has (...) a dubitable claim to be medically beneficial, is rarely clinically indicated, and that conscientious objections should be accepted in these circumstances. We also show that reliance on personal beliefs is difficult to avoid if any form of objection is to be permitted, even if it is based on criteria such as the principles and values of the profession or the scope of professional practice. (shrink)

According to the psychological account of personal identity, our identity is based on the continuity of psychological connections, and so we do not begin to exist until these are possible, some months after conception. This entails the psychological account faces a challenge from the non-identity problem—our intuition that someone cannot be harmed by actions that are responsible for their existence, even if these actions seem clearly to cause them harm. It is usually discussed with regard to preconception harms, but in (...) the context of the psychological account, it is also applicable to prenatal harms. Inflicting prenatal injury is widely thought to be morally impermissible, but if the injury is identity-determining on the psychological account, then no-one seems to be harmed—rather, the injury is responsible for bringing them into existence. Here, I argue that identity-determining injuries can routinely occur on the psychological account, and that this undermines the account. I assess Nicola Williams’ proposal to salvage the account based on a trans-world account of personal identity, and show that it is unsuccessful. I then show that Jeff McMahan’s embodied mind account of personal identity is also susceptible. I conclude that identity-determining prenatal injuries pose a significant challenge for the psychological account and its variants, and provide a reason for supporting alternative accounts that fix personal identity at conception. (shrink)

Prolife theorists typically hold to the claim that all human beings possess equal moral status from conception and consequently possess a right to life. This, they believe, entails that abortion is impermissible in all circumstances. Critics characterize this as an extreme anti-abortion position, as it prima facie allows no exceptions, even in cases of rape. Here, I examine whether the prolife claim regarding equal moral status is compatible with a more attractive moderate stance that permits an exception in the case (...) of rape. I show that Judith Jarvis Thomson's analysis of rights can be used to modify the prolife position in this way, but that doing so involves concessions that prolife theorists are unlikely to find acceptable. (shrink)

Pascal’s wager uses decision theory to argue that it is rational to attempt to nurture belief in God, based on the expected utility of believing (infinite happiness) compared to not believing (at best, only finite happiness). A belief in an eternal conscious torment in hell (infinite suffering) for non-believers makes the differences in expected utility even more apparent, strengthening the argument. Similar reasoning can also be used to calculate the expected moral value of actions, including procreation. Under theism, if possible (...) future children might suffer eternal conscious torment, the expected moral value of procreation is extremely negative. This implies that theists have a moral obligation not to procreate, which for most theists, entails a moral obligation to be celibate or to undergo sterilisation surgery. (shrink)

Opponents of abortion are commonly said to be inconsistent in their beliefs or actions, and to fail in their obligations to prevent the deaths of embryos and fetuses from causes other than induced...

Pro-life advocates commonly argue that fetuses have the moral status of persons, and an accompanying right to life, a view most pro-choice advocates deny. A difficulty for this pro-life position has been Judith Jarvis Thomson’s violinist analogy, in which she argues that even if the fetus is a person, abortion is often permissible because a pregnant woman is not obliged to continue to offer her body as life support. Here, we outline the moral theories underlying public health ethics, and examine (...) the COVID-19 pandemic as an example of public health considerations overriding individual rights. We argue that if fetuses are regarded as persons, then abortion is of such prevalence in society that it also constitutes a significant public health crisis. We show that on public health considerations, we are justified in overriding individual rights to bodily autonomy by prohibiting abortion. We conclude that in a society that values public health, abortion can only be tolerated if fetuses are not regarded as persons. (shrink)

James Sterba has constructed a powerful argument for there being a conflict between the presence of evil in the world and the existence of God. I contend that Sterba’s argument depends on a crucial assumption, namely, that God has an obligation to act according to the principle of meticulous providence. I suggest that two of his analogies confirm his dependence on this requirement. Of course, his argument does not rest on either of these analogies, but they are illustrative of the (...) role that meticulous providence plays in his argument. I then investigate the ethical principles Sterba invokes in his use of meticulous providence and suggest that not only do we often not predicate goodness of human persons based on these principles of obligation, but that these principles are much too stringent to function to determine moral obligations and moral goodness. From there, I contend that to think that God has a similar obligation regarding meticulous providence in order to be good encounters several serious problems, especially with respect to the soul-building Sterba wants to preserve. I conclude by considering Sterba’s reply in terms of a limited application of meticulous providence. (shrink)

I begin by distinguishing four different versions of the argument from evil that start from four different moral premises that in various ways link the existence of God to the absence of suffering. The version of the argument from evil that I defend starts from the premise that if God exists, he would not allow excessive, unnecessary suffering. The argument continues by denying the consequent of this conditional to conclude that God does not exist. I defend the argument against Skeptical (...) Theists who say we are in no position to judge that there is excessive, unnecessary suffering by arguing that this defense has absurd consequences. It allows Young Earthers to construct a parallel argument that concludes that we are in no position to judge that God did not create the earth recently. In the last section I consider whether theists can turn the argument from evil on its head by arguing that God exists. I first criticize Alvin Plantinga’s theory of warrant that one might try to use to argue for God’s existence. I then criticize Richard Swinburne’s Bayesian argument to the same conclusion. I conclude that my version of the argument from evil is a strong argument against the existence of God and that several important responses to it do not defeat it. (shrink)

The alleged conflict between religion and science most pointedly focuses on what it is to be human. Western philosophical thought regarding this has progressed through three broad stages: mind/body dualism, Neo-Darwinism, and most recently strong artificial intelligence (AI). I trace these views with respect to their relation to Christian views of humans, suggesting that while the first two might be compatible with Christian thought, strong AI presents serious challenges to a Christian understanding of personhood, including our freedom to choose, moral (...) choice itself, self-consciousness, and the relevance of God to our beginning, being, and ending. (shrink)

In ’Abortion and deprivation: a reply to Marquis’, Anna Christensen contends that Don Marquis’ influential ’future like ours’ argument for the immorality of abortion faces a significant challenge from the Epicurean claim that human beings cannot be harmed by their death. If deprivation requires a subject, then abortion cannot deprive a fetus of a future of value, as no individual exists to be deprived once death has occurred. However, the Epicurean account also implies that the wrongness of murder is also (...) not grounded in the badness of death, which is strongly counterintuitive. There is an alternative: we can save our intuitions by adopting a more moderate Epicurean account such as that proposed by David Hershenov, who grounds the wrongness of killing in the prevention of the benefit of further good life rather than in the badness of death. Hershenov’s account, however, is equally applicable to Marquis’ argument: abortion similarly prevents a fetus from enjoying the benefit of a future like ours. Consequently, we conclude that Christensen’s criticism of Marquis’ argument fails to undermine his reasoning. (shrink)

Don Marquis’ future-like-ours account argues that abortion is seriously immoral because itdeprives the embryo or fetus of a valuable future much like our own. Marquis was mindful ofcontraception being reductio ad absurdum of his reasoning, and argued that prior tofertilisation, there is not an identifiable subject of harm. Contra Marquis, Tomer Chaffercontends that the ovum is a plausible subject of harm, and therefore contraception deprives theovum of a future-like-ours. In response, I argue that being an identifiable subject of harm is (...) notsufficient for Marquis’ argument to succeed. In addition, we must also share our identity withan ovum. I show that on the account of personal identity utilised by Marquis’ defenders, weare not identical with an ovum. As a result, Chaffer’s reductio fails. (shrink)

The paper defends the claim that it is metaphysically possible that continuants of at least some kinds can have life-histories that incorporate temporal gaps -- i.e., the continuants can go out of existence and then come into existence again. Opponents of this view have included Graham Nerlich and Bernard Williams, whose writings I discuss.i.

J.L. Schellenberg argues that since God, if God exists, possesses both full knowledge by acquaintance of horrific suffering and also infinite compassion, the occurrence of horrific suffering is metaphysically incompatible with the existence of God. In this paper I begin by raising doubts about Schellenberg’s assumptions about divine knowledge by acquaintance and infinite compassion. I then focus on Schellenberg’s claim that necessarily, if God exists and the deepest good of finite persons is unsurpassably great and can be achieved without horrific (...) suffering, then no instances of horrific suffering bring about an improvement great enough to outweigh their great disvalue. I argue that there is no good reason, all things considered, to believe this claim. Thus Schellenberg’s argument from horrors fails. (shrink)

Quantum theory offers mathematical descriptions of measurable phenomena with great facility and accuracy, but it provides absolutely no understanding of why any particular quantum outcome is observed. It is the province of genuine explanations to tell us how things actually work—that is, why such descriptions hold and why such predictions are true. Quantum theory is long on the what, both mathematically and observationally, but almost completely silent on the how and the why. What is even more interesting is that, in (...) some sense, this state of affairs seems to be a necessary consequence of the empirical adequacy of quantum descriptions. One of the most noteworthy achievements of quantum theory is the accurate prediction of phenomena that, on pain of experimental contradiction, have no physical explanation. It is the purpose of this essay to make clear why quantum mechanics and quantum field theory are complete physical descriptions that describe the metaphysical incompleteness of the physical world, then to press the negative implications of this fact for naturalistic metaphysics. (shrink)

This paper is a rejoinder to Michael Almeida's reply to my chapter "Unrestricted Actualization and Divine Providence" in Oxford Studies in Philosophy of Religion Volume 9 (where his reply also appears).

The paper investigates how greater good theodicies are supposed to work, and argues that, in principle, appeal to greater goods can explain why God, if he exists, is justified in refraining from ensuring that there is little or no evil. (Readers interested in objections from alternative goods might also want to look at the rather different discussion of them in Section 7.11 of my book God, The Best, and Evil (OUP 2008).

Hume, in the Enquiry Section X Part 1, claims that ’all probability supposes an opposition of experiments and observations, where one side is found to overbalance the other and to produce a degree of evidence proportioned to the superiority’. He concludes that in assessing miracle-claims one should weigh the historical testimony supporting the miracle against the testimony supporting the regularity to which it is an exception. I argue that both his premise and his conclusion are false.

Joona Räsänen has proposed a concept he calls Schrödinger’s Fetus as a solution to reconciling what he believes are two widely held but contradictory intuitions. I show that Elizabeth Harman’s Actual Future Principle, upon which Schrödinger’s Fetus is based, uses a more convincing account of personhood. I also argue that both Räsänen and Harman, by embracing animalism, weaken their arguments by allowing Don Marquis’ ‘future like ours’ argument for the immorality of abortion into the frame.

In his recent book Is a Good God Logically Possible? and article by the same name, James Sterba argued that the existence of significant and horrendous evils, both moral and natural, is incompatible with the existence of God. He advances the discussion by invoking three moral requirements and by creating an analogy with how the just state would address such evils, while protecting significant freedoms and rights to which all are entitled. I respond that his argument has important ambiguities and (...) that consistent application of his moral principles will require that God remove all moral and natural evils. This would deleteriously restrict not only human moral decision making, but also the knowledge necessary to make moral judgments. He replies to this critique by appealing to the possibility of limited divine intervention, to which I rejoin with reasons why his middle ground is not viable. (shrink)

Attempts to resolve the problem of evil often appeal to a greater good, according to which God’s permission of moral and natural evil is justified because (and just in case) the evil that is permitted is necessary for the realization of some greater good. In the extensive litany of greater good theodicies and defenses, the appeal to the greater good of an afterlife of infinite reward or pleasure has played a minor role in Christian thought but a more important role (...) in Islamic thought. In a recent article, Seyyed Jaaber Mousavirad invites us to reconsider a greater good theodicy of compensation. He contends that not only are all evils justified in that God compensates the sufferer in an afterlife, but because evils experienced produce some good, God has reason for bringing about or allowing evils in the first place (Mousavirad 211). In what follows I argue that this modified compensation theodicy is flawed in its premises, faces serious problems about its concept of justice, treats people as means only and not as intrinsically valuable, and ultimately fails to show that an afterlife compensation, along with some good produced here and now by evil, justify God bringing about or allowing evil. (shrink)

Without embracing Reformed Epistemology (advocated by Plantinga and others), I argue against two claims: (1) A person S is epistemically justified in believing that God exists only if S has a good argument for the existence of God. (2) There are no professional philosophers in our culture today who are justified in believing that God exists even though they do not have, and have never had, a good argument for the existence of God. Likely evidentialist objections are discussed at length.

Two arguments have recently been advanced that Maxwell-Boltzmann particles areindistinguishable just like Bose–Einstein and Fermi–Dirac particles. Bringing modalmetaphysics to bear on these arguments shows that ontological indistinguishabilityfor classical (MB) particles does not follow. The first argument, resting on symmetryin the occupation representation for all three cases, fails since peculiar correlationsexist in the quantum (BE and FD) context as harbingers of ontic indistinguishability,while the indistinguishability of classical particles remains purely epistemic. The secondargument, deriving from the classical limits of quantum statistical partition (...) functions,embodies a conceptual confusion. After clarifying the doctrine of haecceitism, a thirdargument is considered that attempts to deflate metaphysical concerns altogether byshowing that the phase-space and distribution-space representations of MB-statisticshave contrary haecceitistic import. Careful analysis shows this argument to fail as well,leaving de re modality unproblematically grounding particle identity in the classicalcontext while genuine puzzlement about the underlying ontology remains for quantumstatistics. (shrink)

The practice of science rests on the assumption of dependable regularity in the behavior of the physical world. It presumes that the world has an investigable causal structure and that scientific experimentation, observation, and theorizing provide a reliable pathway to its discernment. This much is not in dispute. What is in dispute is what warrants the metaphysical and methodological assumption—essential to the heuristic utility of science—that nature is uniform in such a way that the present can serve as a key (...) to both the past and the future. This article focuses on the metaphysical foundation and justification for uniformitarian assumptions about nature and argues that they are inconsistent with both metaphysical and methodological naturalism. (shrink)

Joona Räsänen has argued that pro‐life arguments against the permissibility of infanticide are not persuasive, and fail to show it to be immoral. We responded to Räsänen’s arguments, concluding that his critique of pro‐life arguments was misplaced. Räsänen has recently replied in ‘Why pro‐life arguments still are not convincing: A reply to my critics’, providing some additional arguments as to why he does not find pro‐life arguments against infanticide convincing. Here, we respond briefly to Räsänen’s critique of the substance view, (...) and also to his most important claim: that possession of a right to life by an infant does not rule out the permissibility of infanticide. We demonstrate that this claim is unfounded, and conclude that Räsänen has not refuted pro‐life arguments against infanticide. (shrink)

The paper reaches two main conclusions: Firstly, even if there are one or more possible worlds than which there are none better, God cannot actualise any of them. Secondly, if there are possible worlds which God can actualise, and than which God can actualise none better, then God must actualise one of them. The paper is neutral between compatibilist and libertarian views of creaturely freedom. The paper's main ideas have been used, with modifications, in my book "God, the Best, and (...) Evil" (OUP 2008). (shrink)

It is a truism that where one starts from and the direction one goes determines where one ends up. This is no less true in philosophy than elsewhere, and certainly no less true in matters dealing with the relationship between God’s foreknowledge and human free actions. In what follows I will argue that the incompatibilist view that Fischer and others stalwartly defend results from the particular starting point they choose, and that if one adopts a different starting point about divine (...) knowledge the logical incompatibility they envision and philosophically anguish over evaporates. (shrink)

The papers that make up this special issue do not take idealized abstractions of context as their point of departure but rather start with the actual phenomena under study and later generalize. We agree that, more often than not, giving a formal model and providing a theory of a loaded notion – such as context – can lead to important insights. Thus, precise models of context and accompanying theories are useful. However, given the widely different fields, methodologies and worldviews within (...) which people study, an approach that starts with the root phenomena/problems and only attempts normalization and generalization post hoc might be a more productive way to proceed. (shrink)

J. L. Mackie, in "The Miracle of Theism" (OUP 1981), chapter 1, argues that "it is pretty well impossible that reported miracles should provide a worthwhile argument for theism addressed to those who are initially inclined to atheism or even to agnosticism." I argue that Mackie fails to establish this conclusion. All that he can show is that those who are initially inclined to theism or agnosticism may be justified in predicting that the next miracle report they examine will not (...) be such as to form the basis for a worthwhile argument for theism. (shrink)

Karl Popper, in "The Logic of Scientific Discovery" Section *vii, argues that if you find that some objecta a,b, c ... have a specific property P, then this discovery by itself does not increase the probability that some other object also has P. He concludes that there can be no effective principle of induction. My paper disproves Popper's claim, using very elementary considerations..

Bioethics, Volume 36, Issue 4, Page 469-471, May 2022.

J. L. Schellenberg, in “A New Logical Problem of Evil,” published in The Blackwell Companion to the Problem of Evil, argues that (if God exists) God has, of necessity, a disappreciation of evil, operating at a metalevel in such a way as to give God a non-defeasible reason to rule out actualizing a world containing evil. He also argues that since God’s motive in creating the world is to share with finite beings the good that God experiences prior to creation, (...) which is good without evil, it follows that God will create a world that contains no evil. I investigate in detail the foregoing lines of argument and provide grounds for rejecting them. My paper is published in Vol 38 No.2, whose date is nominally April 2021 although the issue is not in fact available yet. (shrink)

Our examination of universal origins and fine-tuning will begin with a discussion of infl ationary scenarios grafted onto Big Bang cosmology and the proof that all infl ationary spacetimes are past-incomplete. After diverting into a lengthy critical examination of the “different physics” offered by quantum cosmologists at the past-boundary of the universe, we will proceed to dissect the inadequacies of infl ationary explanations and string-theoretic constructs in the context of three cosmological models that have received much attention: the Steinhardt-Turok cyclic (...) ekpyrotic model (which does not invoke inflation), the Gasperini-Veneziano pre-Big Bang infl ationary model, and the inflationary string landscape model advanced by Susskind, Polchinski, Bousso, and Linde. We will argue that none of these highly speculative string cosmologies removes the necessity of a beginning to the process of universe generation, and we will emphasize the implications of this fact. Then, since the inflationary “mechanism” only really addresses the fi ne-tuning of the initial conditions of the universe and not the conditions embodied in its finely tuned laws and constants, we will analyze the adequacy of the string multiverse in its three versions (cyclic ekpyrotic, pre-Big Bang, and landscape) for explaining the nomological structure and values of these precisely tuned life-compatible universal parameters. When all is said and done, it will be clear that transcendent intelligent agency is not just the only causally suffi cient and therefore metaphysically sound explanation for universal origins and fine-tuning, but it is also much more parsimonious, elegant, and resonant with meaning than all of the ad hoc machinations of multiverse cosmology. (shrink)

The 14-day rule restricts the culturing of human embryos in vitro for the purposes of scientific research for no longer than 14 days. Since researchers recently developed the capability to exceed the 14-day limit, pressure to modify the rule has started to build. Sophia McCully argues that the limit should be extended to 28 days, listing numerous potential benefits of doing so. We contend that McCully has not engaged with the main reasons why the Warnock Committee set such a limit, (...) and these still remain valid. As a result, her case for an extension of the 14-day rule is not persuasive. (shrink)

This is a review of Henk Woldring's book on Karl Mannheim.

Michael Tooley, in Plantinga & Tooley, "Knowledge of God" (Blackwell 2008) argues that, in the absence of strong evidence in favour of the existence of God, the logical probability of God's existence is extremely low. His argument focusses on rightmaking and wrongmaking properties of divine actions, and employs Carnap's inductive logic to reach his conclusion. I argue that Tooley's argument's conceptual foundations are problematic, and that his application of Carnap's inductive logic is flawed. I then provide an alternative analysis of (...) the relevant inductive issues. (shrink)

I reply to criticisms of the divine command theory with an eye to noting the relation of ethics to an ontological ground. The criticisms include: the theory makes the standard of right and wrong arbitrary, it traps the defender of the theory in a vicious circle, it violates moral autonomy, it is a relic of our early deontological state of moral development. I then suggest how Henry Veatch's view of good as an ontological feature of the world provides a context (...) in which the divine command theory can be reasonably justified. (shrink)

Jeremy Williams has argued that if we are committed to a liberal pro-choice stance with regard to selective abortion for disability, we will be unable to justify the prohibition of sex selective abortion. Here, I apply his reasoning to selective abortion based on other traits pregnant women may decide are undesirable. These include susceptibility to disease, level of intelligence, physical appearance, sexual orientation, religious belief and criminality—in fact any traits attributable to some degree to a genetic component. Firstly, I review (...) Williams’ argument, which claims that if a woman is granted the right to abort based on fetal impairment, then by parity of reasoning she should also be granted the right to choose sex selective abortion. I show that these same considerations that entail the permissibility of sex selective abortion are also applicable to genetic selection abortion. I then examine the objections to sex selective abortion that Williams considers and rejects, and show that they also lack force against genetic selection abortion. Finally, I consider some additional objections that might be raised, and conclude that a liberal pro-choice stance on selective abortion for disability entails the permissibility of selective abortion for most genetic traits. (shrink)

This paper, the first of mine to be published, criticizes some arguments against the logical (i.e., metaphysical) possibility that there is incorrigible knoweledge of the external world.