[25] See iv. 6. A polemic against Aristotle, de Anima ii. 5, and the Stoics, Cleanthes, Sextus Empiricus, adv. Math. vii. 288, and Chrysippus, Diog. Laert. vii. 50.
[26] As thought Chrysippus, Diog. Laert. vii. 111.
[27] See iv. 6.
[28] See vi. 6.16.
[29] See ii. 6.2.
[30] Plato, in his Phaedo 127.
[31] See i. 2.1.
[32] See i. 2.1, the Socratic definition.
[33] See i. 1.2.4.
[34] See ii. 5.2.