The proof that you know something is that you are able to teach it

Evidence from torture may be considered completely untrustworthy

Between friends there is no need of justice.

The continuum is that which is divisible into indivisibles that are infinitely divisible.

We ought not to listen to those who exhort us, because we are human, to think of human things....We ought rather to take on immortality as much as possible, and do all that we can to live in accordance with the highest element within us; for even if its bulk is small, in its power and value it far exceeds everything.

And inasmuch as the great-souled man deserves most, he must be the best of men; for the better a man is the more he deserves, and he that is best deserves most. Therefore the truly great-souled man must be a good man. Indeed greatness in each of the virtues would seem to go with greatness of soul.

Both oligarch and tyrant mistrust the people, and therefore deprive them of their arms.