Riches ennoble a man's circumstances, but not himself.

Philosophy stands in need of a science which shall determine the possibility, principles, and extent of human knowledge à priori.

Always recognize that human individuals are ends, and do not use them as means to your end.

In all judgements by which we describe anything as beautiful, we allow no one to be of another opinion.

The sceptics, a kind of nomads, despising all settled culture of the land, broke up from time to time all civil society. Fortunately their number was small, and they could not prevent the old settlers from returning to cultivate the ground afresh, though without any fixed plan or agreement.

Man relates to material things through direct insight rather than reason.

Always treat people as ends in themselves, never as means to an end.