I am, therefore there is a God.

Consciousness of myself, combined with complete ignorance of everything that does not fall within my sphere of thinking, is the most telling proof of my substantiality outside God, of my original existence

My religion recognizes no obligation to resolve doubt other than through rational means; and it commands no mere faith in eternal truths

I fear that, in the end, the famous debate among materialists, idealists, and dualists amounts to a merely verbal dispute that is more a matter for the linguist than for the speculative philosopher

Socrates didn't care to visit the theater, as a rule, except when the plays of Euripides (which some think, he himself had helped to compose), were performed.

The principal axiom in their theory was: Everything can be proved, and everything can be disproved; and in the process, one must profit as much from the folly of others, and from his own superiority, as he can.

We consider the beauty of nature and art with pleasure and satisfaction, without the slightest movement of desire. Instead, it appears to be a particular mark of beauty that it is considered with tranquil satisfaction; that it pleases if we also do not possess it and we are still far removed from demanding to possess it