When we have told how things behave when they are electrified, and under what circumstances they are electrified, we have told all there is to know

Ethics is in origin the art of recommending to others the sacrifices required for cooperation with oneself.

One of the troubles about vanity is that it grows with what it feeds on. The more you are talked about, the more you will wish to be talked about.

Although it is a gloomy view to suppose that life will die out, sometimes when I contemplate the things that people do with their lives I think it is almost a consolation

What the world needs is not dogma but an attitude of scientific inquiry.

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

There is no logical impossibility in the hypothesis that the world sprang into being five minutes ago, exactly as it then was, with a population that "remembered" a wholly unreal past. There is no logically necessary connection between events at different times; therefore nothing that is happening now or will happen in the future can disprove the hypothesis that the world began five minutes ago.