According to the ancient Greek Stoics, the cosmos regularly transitions between periods of conflagration, during which only fire exists, and periods of cosmic order, during which the four elements exist. This paper examines the cosmogonic process by which conflagrations are extinguished and cosmic orders are restored, and it defends three main conclusions. First, I argue that not all the conflagration’s fire is extinguished during the cosmogony, against recent arguments by Ricardo Salles. Second, at least with respect to the cosmogony, it (...) is not necessary to posit the existence of proto-elements. Third, while scholars such as Salles and David Hahm have argued that Cleanthes held a distinct theory of cosmogony from Zeno and Chrysippus, I argue that each of these Stoics endorse the same cosmogonic theory. (shrink)

Sources for Stoicism present conflicting accounts of the Stoic principles. Some suggest that the principles are inseparable from each other. Others suggest that they are separable. To resolve this apparent interpretive dilemma, I distinguish between the functions of the principles and the bodies that realize those functions. Although the principles cannot separate when realizing their roles, the Stoic theory of blending entails that the bodies that realize those roles are physically separable. I present a strategy for further work on the (...) principles in light of this interpretation. (shrink)

Isaac Newton, in popular imagination the Ur-scientist, was an outstanding humanist scholar. His researches on, among others, ancient philosophy, are thorough and appear to be connected to and fit within his larger philosophical and theological agenda. It is therefore relevant to take a closer look at Newton’s intellectual choices, at how and why precisely he would occupy himself with specific text-sources, and how this interest fits into the larger picture of his scientific and intellectual endeavours. In what follows, we shall (...) follow Newton into his study and look over his shoulder while reading compendia and original source-texts in his personal library at Cambridge, meticulously investigating and comparing fragments and commentaries, and carefully keeping track in private notes of how they support his own developing ideas. Indeed, Newton was convinced that precursors to his own insights and discoveries were present already in Antiquity, even before the Greeks, in ancient Egypt, and he puts a lot of time and effort into making the point, especially, and not incidentially, in the period between the first and the second edition of the Principia. A clear understanding of his reading of the classic sources therefore matters to our understanding of its content and gestation process. In what follows we will confine ourselves to the classical legacy, and investigate Newton’s intellectual intercourse with it. (shrink)

In a recent discussion note1 C. D. C. Reeve investigates the reasons for Heraclitus assigning a primary position to fire, as contrasted with the other substances like earth and water which go to make up the physical universe. Reeve considers and rejects other reasons for the primacy of fire that have been put forward, such as the symbolic associations of fire, the role of fire in governing the universe, or the claim that everything becomes fire at some time or other. (...) Rather, Reeve argues, the primacy of fire in Heraclitus' physical theory can be explained purely in terms of that physical theory. (shrink)

R. Saadia Ga'on, which is known to have been substantially influenced by Saadia, in fine is also indebted to Stoic philosophy and physics.

This paper tries to demonstrate that some passages of Pliny's Naturalis historia on metallurgical materials are influenced by the Stoic philosopher Posidonius' view that surfaces possess a physical existence. Indeed, Pliny reports that copper surfaces are material, both acting towards drawing a patina to themselves, and being acted upon; i.e. they are both chemically modified by air and fire, and subject to mechanical removal. Also relatable to Posidonius, namely to his view of the interaction between soul and body, is Pliny's (...) account of lead and tin, which can be united thanks to the action they mutually exert on each other, since each metal holds together both itself and what is outside itself. A further influence from the ‘aetiologist’ Posidonius is also betrayed in the care Pliny exercises in describing not only metal corrosion and soldering, but also their causes. Both the scientific and the philosophical imports of these passages are compared with passages by Plato and Plutarch on metallurgical subjects; they are also discussed in the light of the theories on ‘mixture’ propounded by Aristotle and by the Old Stoics. It is shown that Pliny's account compares favorably with Posidonius' doctrine, whereas it is at striking variance with the other ancient reports. Introduction Philosophical and literary evidence 2.1 Pliny 2.2 Posidonius 2.3 Plato and Plutarch Discussion Conclusion. (shrink)

We know enough about Posidonius' life to trace his wanderings: he was born into a wealthy and influential family in Apamea, Syria; he went through all the steps of an Hellenistic education; in Athens he encountered his Stoic teacher Panaetius; and finally he settled—except for some travelling throughout the Mediterranean and to Rome—in the high society of Rhodes, where he actively participated in political life and headed a Stoic school.

We know enough about Posidonius' life to trace his wanderings: he was born into a wealthy and influential family in Apamea, Syria; he went through all the steps of an Hellenistic education; in Athens he encountered his Stoic teacher Panaetius; and finally he settled—except for some travelling throughout the Mediterranean and to Rome—in the high society of Rhodes, where he actively participated in political life and headed a Stoic school.

In a recent discussion note1 C. D. C. Reeve investigates the reasons for Heraclitus assigning a primary position to fire, as contrasted with the other substances like earth and water which go to make up the physical universe. Reeve considers and rejects other reasons for the primacy of fire that have been put forward, such as the symbolic associations of fire, the role of fire in governing the universe, or the claim that everything becomes fire at some time or other. (...) Rather, Reeve argues, the primacy of fire in Heraclitus' physical theory can be explained purely in terms of that physical theory. (shrink)

R. Saadia Ga'on (882–942) de Baghdad tâchait d'éviter l'anthropomorphisme en avançant que les versets bibliques qui semblent attribuer des traits matériels à Dieu portent non sur Dieu Lui-même, mais sur une entité créée, la Gloire de Dieu, que Saadia décrivait comme un “air” extrêmement subtil. Cet article s'efforce de montrer que la conception saadienne d'un air quasi divin, par lequel Dieu accomplit Ses actes dans le monde matériel, est redevable à la doctrine stoïcienne dupneuma. Il s'ensuit que la théologie immanentiste (...) desḤasidey Ashkenaz(Piétistes allemands), que l'on sait avoir été trés influencée par Saadia, est un prolongement lointain de la philosophic et de la physique stoïciennes. (shrink)

The Stoics’ way of presenting principles – the active and the passive – is ambiguous because they say that principles are two while also suggesting that they are inseparable and thus interdependent. This ambiguity cannot be resolved in favour of one or the other side of the dilemma, as is shown by analysis of two possible models of the relations among principles – a causal and a categories-based model. This ambiguity is rather a necessary consequence of the Stoic view of (...) principles and should be compared to the ambiguity of Plato’s concept of “principles” in the Timaeus. Plato’s Receptacle is in a similar relation to other constitutive elements of his cosmogonical account as are the two Stoic principles, each to the other. In particular, the relation between the Receptacle and qualities in it is to be seen as a systematic parallel to the relation of the Stoic principles (and probably also its historical model). The concluding claim is that Plato and the Stoics advance a similar kind of dualism which should be called such, despite its ambiguity. The ambiguity in both systems is due to the need to see the principles in such a relation as would reveal their dependence, and thus secure the basic unity of the cosmos. (shrink)

The aim of this paper is to explore how the cosmic soul works and how it accomplishes its providential and demiurgic tasks in Chrysippus’ system. Drawing on (i) the analogy Chrysippus establishes between the individuum and the cosmos and (ii) biological and medical theories of respiration, digestion, and pulse, I will show that the movements of Chrysippus’ cosmic soul reproduce the processes of digestion, pulse, and respiration at a cosmic level. My claim is that Chrysippus, in addition to adopting Praxagoras’ (...) notion that inhaled air nourishes pneuma—well established in the scholarship—appropriated Aristotle’s complex mechanism of respiration and digestion based on the teleological role of cold air, crucial for preserving vital heat. So understood, Chrysippus’ application of biological notions to cosmology allows him to endow the active principle with effective causation throughout the cosmos. (shrink)