Population pressure is the ultimate cause of every war.

Brains are no good if you don't use them.

Maturity is the ability to sort the portions of truth from the accepted lies and self-deceptions that you have grown up with.

You can't stamp on people and not get hurt in return.

This is what makes science so hard, and ultimately so fun. Think of the limits of what we know as a great suite of rooms inhabited by vast numbers of incredibly busy, incredibly messy, nearsighted people, all of whom are eccentric recluses.

I finished by saying that it struck me that all the ethical systems I was discussing were after the fact. That is, that people act as they are disposed to, but they like to feel afterwards that they were right and so they invent systems that approve of their dispositions.

Some people get a feeling of power from being unpleasant.