Everybody should espouse three or four harmless crank theories for the pure pleasure of having something harmless to be cranky about. And when a theory of this sort proves correct, it is a true moment for celebration.

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

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.

If I had the opportunity, I would make the proposal that no man should be killed except by somebody who knows him well enough for the act to have impact. No death should be like nose blowing. Death is important enough that it should affect the person who causes it.

Population pressure is the ultimate cause of every war.

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.