All art, all education, can be merely a supplement to nature.

It is just that we should be grateful, not only to those with whose views we may agree, but also to those who have expressed more superficial views; for these also contributed something, by developing before us the powers of thought.

The law does not expressly permit suicide, and what it does not permit it forbids.

Have a definite, clear, practical ideal - a goal, an objective.

Happiness does not consist in amusement. In fact, it would be strange if our end were amusement, and if we were to labor and suffer hardships all our life long merely to amuse ourselves.... The happy life is regarded as a life in conformity with virtue. It is a life which involves effort and is not spent in amusement.

While fiction is often impossible, it should not be implausible.

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