For nature by the same cause, provided it remain in the same condition, always produces the same effect, so that either coming-to-be or passing-away will always result.

Philosophy can make people sick.

A friend is simply one soul in two bodies.

Misfortune shows those who are not really friends.

The science that studies the supreme good for man is politics.

There are three qualifications required in those who have to fill the highest offices, - (1) first of all, loyalty to the established constitution; (2) the greatest administrative capacity; (3) virtue and justice of the kind proper to each form of government.

I will not allow the Athenians to sin twice against philosophy.