The seen is the changing, the unseen is the unchanging.

The worst of all deceptions is self-deception.

The soul of him who has education is whole and perfect and escapes the worst disease, but, if a man's education be neglected, he walks lamely through life and returns good for nothing to the world below.

Not only is the old man twice a child, but also the man who is drunk.

The highest form of pure thought is in mathematics.

Wealth and poverty; one is the parent of luxury and indolence, and the other of meanness and viciousness, and both of discontent.

Other people are likely not to be aware that those who pursue philosophy aright study nothing but dying and being dead. Now if this is true, it would be absurd to be eager for nothing but this all their lives, and then to be troubled when that came for which they had all along been eagerly practicing.