The infliction of cruelty with a good conscience is a delight to moralists - that is why they invented hell.

Philosophy, though unable to tell us with certainty what is the true answer to the doubts which it raises, is able to suggest many possibilities which enlarge our thoughts and free them from the tyranny of custom.

God and Satan alike are essentially human figures, the one a projection of ourselves, the other of our enemies.

Never let yourself be diverted, either by what you wish to believe, or what you think could have beneficent social effects if it were believed; but look only and solely at what are the facts.

You could live without the opera singer, but not without the services of the baker. On this ground you might say that the baker performs a greater service; but no lover of music would agree.

The Axiom of Choice is necessary to select a set from an infinite number of socks, but not an infinite number of shoes.

We shall say that we have acquaintance with anything of which we are directly aware, without the intermediary of any process of inference of any knowledge of truths.