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

Thought is subversive and revolutionary, destructive and terrible, Thought is merciless to privilege, established institutions, and comfortable habit. Thought is great and swift and free.

Punctuality is a quality the need of which is bound up with social co-operation.

When we look at a rock what we are seeing is not the rock, but the effect of the rock upon us.

I conclude that, while it is true that science cannot decide questions of value, that is because they cannot be intellectually decided at all, and lie outside the realm of truth and falsehood. Whatever knowledge is attainable, must be attained by scientific methods; and what science cannot discover, mankind cannot know.

To think I have spent my life on absolute muck.

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