Friendship is essentially a partnership.

The so-called Pythagoreans, who were the first to take up mathematics, not only advanced this subject, but saturated with it, they fancied that the principles of mathematics were the principles of all things.

A constitution is the arrangement of magistracies in a state.

There are some jobs in which it is impossible for a man to be virtuous.

The knowledge of the soul admittedly contributes greatly to the advance of truth in general, and, above all, to our understanding of Nature, for the soul is in some sense the principle of animal life.

Young people are in a condition like permanent intoxication, because life is sweet and they are growing.

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