For as there are misanthropists, or haters of men, there are also misologists, or haters of ideas, and both spring from the same cause, which is ignorance of the world.

Wisest is he who knows what he does not know.

I don't know anything that gives me greater pleasure, or profit either, than talking or listening to philosophy. But when it comes to ordinary conversation, such as the stuff you talk about financiers and the money market, well, I find it pretty tiresome personally, and I feel sorry that my friends should think they're being very busy when they're really doing absolutely nothing. Of course, I know your idea of me: you think I'm just a poor unfortunate, and I shouldn't wonder if your right. But then I dont THINK that you're unfortunate - I know you are.

Man was not made for himself alone

Knowledge is the rediscovering of our own insight.

Our need will be the real creator.

The science [geometry] is pursued for the sake of the knowledge of what eternally exists, and not of what comes for a moment into existence, and then perishes.