Greek philosopher.
He viewed philosophy as a necessary pursuit of all intelligent men; Teacher of Plato.
Employ your time improving yourself by other men's writings so that you shall come easily to what others have labored hard for.
There is only one good -- knowledge; and only one evil -- ignorance.
"When desire, having rejected reason and overpowered judgment which leads to right, is set in the direction of the pleasure which beauty can inspire . . ."
Living well and beautifully and justly are all one thing.
"But already it is time to depart, for me to die, for you to go on living; which of us takes the better course, is concealed from anyone except God."