The race of the guardians must be kept pure.

You ought not attempt to cure the eyes without the head, or the head without the body, so neither ought you attempt to cure the body without the soul.

When the mind's eye rests on objects illuminated by truth and reality, it understands and comprehends them, and functions intelligently; but when it turns to the twilight world of change and decay, it can only form opinions, its vision is confused and its beliefs shifting, and it seems to lack intelligence.

Trees and fields tell me nothing: men are my teachers.

There are some whom the applause of the multitude has deluded into the belief that they are really statesmen.

We must infer that all things are produced more plentifully and easily and of a better quality when one man does one thing which is natural to him and does it at the right time, and leaves other things.

Discordance is evil. Harmony is virtue.