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.

All human actions have one or more of these seven causes: chance, nature, compulsion, habit, reason, passion, and desire.

All virtue is summed up in dealing justly.

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.

Man is by nature a political animal.

Man perfected by society is the best of all animals; he is the most terrible of all when he lives without law, and without justice.

Misfortune shows those who are not really friends.

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.