Against my will, in the course of my travels, the belief that everything worth knowing was known at Cambridge gradually wore off. In this respect my travels were very useful to me.

A thing is not necessarily true because a man dies for it.

My personal feeling is that understanding evolution led me to atheism.

Men's actions are too strong for them. Show me a man who has acted, and who has not been the victim and slave of his action.

There's nothing like the endorphins from being fit, and the incredible endorphin rush that goes with that.