Aristotle

Wit is well-bred insolence.

A friend is a second self.

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

There is no great genius without some touch of madness.

The aim of the wise is not to secure pleasure, but to avoid pain.

Whosoever is delighted in solitude is either a wild beast or a god.

Some animals are cunning and evil-disposed, as the fox; others, as the dog, are fierce, friendly, and fawning. Some are gentle and easily tamed, as the elephant; some are susceptible of shame, and watchful, as the goose. Some are jealous and fond of ornament, as the peacock.

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

Education is the best provision for old age.

Even when laws have been written down, they ought not always to remain unaltered.

Happiness depends upon ourselves.

He who has overcome his fears will truly be free.

He who is unable to live in society, or who has no need because he is sufficient for himself, must be either a beast or a god.

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.

In all things of nature there is something of the marvelous.

It is in justice that the ordering of society is centered.

Nature does nothing uselessly.

One swallow does not make a summer, neither does one fine day; similarly one day or brief time of happiness does not make a person entirely happy.

Plato is dear to me, but dearer still is truth.

Pleasure in the job puts perfection in the work.