I have no knowledge of myself as I am, but merely as I appear to myself.

Feminine traits are called weaknesses. People joke about them; fools ridicule them; but reasonable persons see very well that those traits are just the tools for the management of men, and for the use of men for female designs.

It is precisely in knowing its limits that philosophy consists.

But although all our knowledge begins with experience, it does not follow that it arises from experience.

We ourselves introduce that order and regularity in the appearance which we entitle "nature". We could never find them in appearances had we not ourselves, by the nature of our own mind, originally set them there.

Experience without theory is blind, but theory without experience is mere intellectual play.

Man's greatest concern is to know how he shall properly fill his place in the universe and correctly understand what he must be in order to be a man.