Women remain children all their lives, for they always see only what is near at hand, cling to the present, take the appearance of a thing for reality, and prefer trifling matters to the most important.

Life is a language in which certain truths are conveyed to us; if we could learn them in some other way, we should not live.

What now on the other hand makes people sociable is their incapacity to endure solitude and thus themselves.

Life without pain has no meaning.

Restlessness is the hallmark of existence.

It often happens that we blurt out things that may in some kind of way be harmful to us, but we are silent about things that may make us look ridiculous; because in this case effect follows very quickly on cause.

Physics is unable to stand on its own feet, but needs a metaphysics on which to support itself, whatever fine airs it may assume towards the latter.