In his refutation of skepticism in book IV of De rerum natura, Lucretius uses argumentative methods typical of Epicurus: the περιτροπή is in many ways similar to that used by the philosopher in book XXV of Περὶ φύσεως, the same book where, in a passage dedicated to the criticism against determinists, can be found a reference to the criterion of the πρόληψις, that Lucretius exploits in his refutation. Moreover, Lucretius develops a strong demonstration concerning the irrefutability of αἴσθησις as a (...) criterion of truth, which finds significant points of contact with a large fragment, transmitted by Diogenes Laertius and generally traced back to the Canon of Epicurus. The last argument used by the poet is a pragmatic one: for the skeptic it would be impossible to live. The argument is similar to the praxis-based argument used by Epicurus in the Περὶ φύσεως against the partisans of determinism. But the pragmatic argument goes back to a very ancient layer of anti-skeptical polemics, even prior to Epicurus and already present in book Γ of Aristotle’s Metaphysics. Although later influences cannot be excluded, Lucretius appears to be a faithful witness of Epicurus. Probably in a lost section of the Περὶ φύσεως, the philosopher of Samos showed positions going against skeptical or proto-skeptical attitude, contemporary or earlier to the time of the philosopher, probably developed in a Democritean or a Socratic context. Epicurus’ ad hominem strategy is very close to that of the philosopher in the Principal Doctrines XXIII–XXV, and certainly follows Aristotle’ strategy in book Γ of Metaphysics against those who deny the principle of non-contradiction. In a similar way, Epicurus does not have one figure as the objective of his refutation but constructs a hypothetical dialectical opponent capable of embodying a series of philosophical tendencies judged by the founder of Kepos to be extremely dangerous not only for the correct exercise of thought but for the human being’s life itself. (shrink)

Giovanni Pico della Mirandola (1463-1494) focuses on Anaxagoras (ca. 500-428 BC) because he considers him as a precursor of the the later Neoplatonic concept all things exist in all things in their own mode, which became the core of Pico’s metaphysics. Anaxagoras’s philosophy permits Pico to establish his doctrine that all things share a portion of God within them, in their own way. Pico rejects the fixed position of man in the ontological hierarchy. Man has the chance to become everything. (...) Pico asserts that man contains all things in himself as their center, just like God contains all things as their origin. As a consequence, Anaxagoras’s principle is supportive to Pico’s metaphysics. Furthermore, Anaxagoras’s metaphysical principle is supportive of Pico’s method of allegorical interpretation, which is indispensable for his syncretism and his attempt to reveal hidden truths in every text or level of reality. (shrink)

The first part of this paper looks into the question of Lucretius’ philosophical sources and whether he draws almost exclusively from Epicurus himself or also from later Epicurean texts. I argue that such debates are inconclusive and likely will remain so, even if additional Epicurean texts are discovered, and that even if we were able to ascertain Lucretius’ philosophical sources, doing so would add little to our understanding of the De Rerum Natura. The second part of the paper turns to (...) a consideration of what Lucretius does with his philosophical sources. The arguments within the De Rerum Natura are not original. Nonetheless, the way Lucretius presents these arguments establishes him as a distinctive philosopher. Lucretius deploys non-argumentative methods of persuasion such as appealing to emotions, redeploying powerful cultural tropes, and ridicule. These methods of persuasion do not undercut or displace reasoned argumentation. Instead, they complement it. Lucretius’ use of these methods is rooted in his understanding of human psychology, that we have been culturally conditioned to have empty desires, false beliefs, and destructive emotions, ones that are often subconscious. Effective persuasion must take into account the biases, stereotypes, and other psychological factors that hinder people from accepting Epicurus’ healing gospel. (shrink)