Sometimes I think we're alone in the universe, and sometimes I think we're not. In either case the idea is quite staggering.

I don't pretend we have all the answers. But the questions are certainly worth thinking about.

The best measure of a man's honesty isn't his income tax return. It's the zero adjust on his bathroom scale.

It has yet to be proven that intelligence has any survival value.

If an elderly but distinguished scientist says that something is possible, he is almost certainly right; but if he says that it is impossible, he is very probably wrong.

Any sufficiently advanced technology is indistinguishable from magic.

The best thing to hold onto in life is each other.

Wisdom, compassion, and courage are the three universally recognized moral qualities of men.

Marriage is popular because it combines the maximum of temptation with the maximum of opportunity.

Whatever your situation might be, set your mind to whatever you want to do and put a good attitude in it, and I believe that you can succeed. You are not going to get anywhere just sitting on your butt and moping around.

A garden is always a series of losses set against a few triumphs, like life itself.

It is a far, far better thing that I do, than I have ever done; it is a far, far better rest that I go to than I have ever known.

Human life is far more important than just getting to the top of a mountain.

To the well-organized mind, death is but the next great adventure.

The truth is rarely pure and never simple.