Physics, owing to the simplicity of its subject matter, has reached a higher state of development than any other science.

Find more pleasure in intelligent dissent than in passive agreement, for, if you value intelligence as you should, the former implies a deeper agreement than the latter.

The difficulty is old, but none the less real. An omnipotent being who created a world containing evil not due to sin must Himself be at least partially evil.

No satisfaction based upon self-deception is solid.

The most savage controversies are about matters as to which there is no good evidence either way.

Well, there are many religions, but I suppose they all worship the same God.

What makes a free thinker is not his beliefs, but the way in which he holds them. If he holds them because his elders told him they were true when he was young, or if he holds them because if he did not he would be unhappy, his thought is not free; but if he holds them because, after careful thought, he finds a balance in their favor, then his thought is free, however odd his conclusions may seem.