Life must be lived as play, playing certain games, making sacrifices, singing and dancing, and then a man will be able to propitiate the gods.

A grateful mind is a great mind which eventually attracts to itself great things.

All I really know is the extent of my own ignorance

If a man says that it is right to give every one his due, and therefore thinks within his own mind that injury is due from a just man to his enemies but kindness to his friends, he was not wise who said so, for he spoke not the truth, for in no case has it appeared to be just to injure any one.

If in a discussion of many matters ... we are not able to give perfectly exact and self-consistent accounts, do not be surprised: rather we would be content if we provide accounts that are second to none in probability.

Knowledge becomes evil if the aim be not virtuous.

Whenever a person strives, by the help of dialectic, to start in pursuit of every reality by a simple process of reason, independent of all sensuous information - never flinching, until by an act of the pure intelligence he has grasped the real nature of good - he arrives at the very end of the intellectual world.