Every art and every inquiry, and similarly every action and pursuit, is thought to aim at some good; and for this reason the good has rightly been declared to be that at which all things aim.

Knowing what is right does not make a sagacious man.

The shape of the heaven is of necessity spherical; for that is the shape most appropriate to its substance and also by nature primary.

Nowadays, for the sake of the advantage which is to be gained from the public revenues and from office, men want to be always in office.

For it is owing to their wonder that men both now begin and at first began to philosophize... They were pursuing science in order to know, and not for any utilitarian end.

The man who is content to live alone is either a beast or a god.

The soul suffers when the body is diseased or traumatized, while the body suffers when the soul is ailing.