1. It is hard for us to comprehend this revolution – but that is only because the revolution succeeded, and we are its heirs. To put it in context, if a similar revolution were to start today, it would have to establish some human faculty other than the rational mind.

2. Hence, in both Plato and Xenophon, Socrates stresses the importance of self-knowledge; see, for example, Plato, Alcibiades I; Xenophon, Memoirs, 4.2.24–29.

3. See The Estate-manager, 1.16–23; as Plato says in Hippias Minor, aknowledge-able person can choose to use his knowledge for either good or bad results, but an ignorant person is restricted to bad results.