Aristotle

For the things we have to learn before we can do, we learn by doing.

What it lies in our power to do, it lies in our power not to do.

Happiness is thought to depend on leisure; for we are busy that we may have leisure, and make war that we may live in peace.

The best friend is he that, when he wishes a person's good, wishes it for that person's own sake.

All men by nature desire to know.

One swallow does not make a summer, nor does one day; and so too one day, or a short time, does not make a man blessed and happy.

Any one can get angry — that is easy — but to do this to the right person, to the right extent, at the right time, with the right motive, and in the right way, that is not for every one, nor is it easy.

Our characters are the result of our conduct.

Without friends no one would choose to live, though he had all other goods.

We are busy that we may have leisure, and make war that we may live in peace.

Hope is the dream of a waking man.

A friend is one soul abiding in two bodies.