Aristotle:

A friend is a second self.

All paid jobs absorb and degrade the mind.

Dignity consists not in possessing honors, but in the consciousness that we deserve them.

Education is the best provision for the journey to old age.

Happiness depends upon ourselves.

Humor is the only test of gravity, and gravity of humor; for a subject which will not bear raillery is suspicious, and a jest which will not bear serious examination is false wit.

It is the mark of an educated mind to be able to entertain a thought without accepting it.

Law is mind without reason.

Pleasure in the job puts perfection in the work.

Poverty is the parent of revolution and crime.

The gods too are fond of a joke.

The only stable state is the one in which all men are equal before the law.

To perceive is to suffer.

We are what we repeatedly do.

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

It is not always the same thing to be a good man and a good citizen.

Misfortune shows those who are not really friends.

Education is the best provision for old age.

Hope is a waking dream.