Religions that teach brotherly love have been used as an excuse for persecution, and our profoundest scientific insight is made into a means of mass destruction.

Science, by itself cannot, supply us with an ethic.

Indignation is a submission of our thoughts, but not of our desires.

Love is wise; hatred is foolish. In this world, which is getting more and more closely interconnected, we have to learn to tolerate each other, we have to learn to put up with the fact that some people say things that we don't like. We can only live together in that way. But if we are to live together, and not die together, we must learn a kind of charity and a kind of tolerance, which is absolutely vital to the continuation of human life on this planet.

Emphatic and reiterated assertion, especially during childhood, produces in most people a belief so firm as to have a hold even over the unconscious.

Zeno was concerned with three problems... These are the problem of the infinitesimal, the infinite, and continuity.

Animal rights, taken to their logical conclusion, mean votes for oysters.