Science demands patience.

The limits of the possible can only be defined by going beyond them into the impossible.

I don't believe in astrology; I'm a Sagittarius and we're skeptical.

The only way to define your limits is by going beyond them.

The greatest tragedy in mankind's entire history may be the hijacking of morality by religion.

The moon is the first milestone on the road to the stars.

I'm sure the universe is full of intelligent life. It's just been too intelligent to come here.

Any sufficiently advanced technology is indistinguishable from magic.

There is hopeful symbolism in the fact that flags do not wave in a vacuum.

Two possibilities exist: either we are alone in the Universe or we are not. Both are equally terrifying.

Until we get rid of religion, we won't be able to conduct the search for God.

Learn to uncrumple yourself, for life and people are always gung ho to crush you.

But can we, should we, let apprehensions about the future immobilize us in the present?

One, who suicides, is itself a killer and itself a victim. To trigger that has its decision, and own willingness, no one else.

(I'm) the only one to take out half a brain, although you would think, if you go to Washington, that someone had beat me to it.

My parents and I always put great emphasis on telling stories that appeal to a child's sense of humor.

When you sit face to face with someone who is pleasant, respectful, and polite, you have hard time reminding yourself that nothing he says is true/sincere.

I've always figured that if God wanted us to go to church a lot He'd have given us bigger behinds to sit on and smaller heads to think with.

Algebra is nothing more than geometry, in words; geometry is nothing more than algebra, in pictures.

How immense to us appear the sins we have not committed.

Civilized ages inherit the human nature which was victorious in barbarous ages, and that nature is, in many respects, not at all suited to civilized circumstances.