If I had found out anything, it was that they could print it faster than I could study it.

Once you get to earth orbit, you're halfway to anywhere in the solar system.

It seems to me that the secret of true happiness in life is to know what you are and then be content to be that, in style, head up and proud, and not yearn to be something else.

Never appeal to a man's 'better nature.' He may not have one. Invoking his self-interest gives you more leverage.

The basic of all morality is duty, a concept with the same relation to group that self-interest has to individual.

I never learned from a man who agreed with me.

But goodness alone is never enough. A hard, cold wisdom is required for goodness to accomplish good. Goodness without wisdom always accomplishes evil.