Love is a serious mental disease.

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.

If there is a good and wise God, then there also exists a progress of humanity toward perfection.

The price of apathy towards public affairs is to be ruled by evil men.

Other people are likely not to be aware that those who pursue philosophy aright study nothing but dying and being dead. Now if this is true, it would be absurd to be eager for nothing but this all their lives, and then to be troubled when that came for which they had all along been eagerly practicing.

Ignorance: the root of all evil.

There still remain three studies suitable for free man. Arithmetic is one of them.