All art, all education, can be merely a supplement to nature.

Man is the metre of all things, the hand is the instrument of instruments, and the mind is the form of forms.

The law is reason unaffected by desire.

The avarice of mankind is insatiable; at one time two obols was pay enough; but now, when this sum has become customary, men always want more and more without end.

A period may be defined as a portion of speech that has in itself a beginning and an end, being at the same time not too big to be taken in at a glance

He who cannot see the truth for himself, nor, hearing it from others, store it away in his mind, that man is utterly worthless.

The quality of life is determined by its activities.