Then not only an old man, but also a drunkard, becomes a second time a child.

I shall assume that your silence gives consent.

The human race will have no respite from evils until those who are really philosophers acquire political power or until, through some divine dispensation, those who rule and have political authority in the cities become real philosophers.

How can you prove whether at this moment we are sleeping, and all our thoughts are a dream; or whether we are awake, and talking to one another in the waking state?

To do injustice is more disgraceful than to suffer it.

He who has knowledge of the just and the good and beautiful ... will not, when in earnest, write them in ink.

Thinking: the talking of the soul with itself.