The highest form of pure thought is in mathematics.
False words are not only evil in themselves, but they infect the soul with evil.
The soul is like a pair of winged horses and a charioteer joined in natural union.
A man who really fights for justice must lead a private, not a public, life if he is to survive for even a short time.
Do thine own work, and know thyself.
Your dog is your only philosopher.