Really exotic methods of propulsion . . . will have to be devised to get there. How it will be done, I do not know. Whether it will be done, I am not quite certain. But I would bet it can be done.

The science of today is the technology of tomorrow.

Secrecy in science does not work. Withholding information does more damage to us than to our competitors.

There's no system foolproof enough to defeat a sufficiently great fool.

I believe in evil. It is the property of all those who are certain of truth. Despair and fanaticism are only differing manifestations of evil.

The extinction of the human race will come from its inability to EMOTIONALLY comprehend the exponential function.

Science attempts to find logic and simplicity in nature. Mathematics attempts to establish order and simplicity in human thought.

No endeavor that is worthwhile is simple in prospect; if it is right, it will be simple in retrospect.

We must learn to live with contradictions, because they lead to deeper and more effective understanding.

Had we not pursued the hydrogen bomb, there is a very real threat that we would now all be speaking Russian. I have no regrets.

I think that intellectuals who end up in hell will have to read page proofs and check indexes there.

Never criticize, complain or condemn. Never forget to appreciate with love what is good in a person.

Science is a way of talking about the universe in words that bind it to a common reality.Magic is a method of talking to the universe in words that it cannot ignore.The two are rarely compatible.

You can never hurt me, And you will never cause me painCause you're made of fire, And I'm the heavy rain.

I like listening to the whole song. Like my father says, "If you can't pick the whole song, then why are you playing it?"

My comedy comes from pain. I can't stand to see someone hurting.

I know this doesn't last forever, so I'm cherishing every minute of it.

Unhappiness has nothing to teach, and resignation is ugly.

Everyone knows that (1) happiness is the goal of life, and (2) happiness is a chimera.

I get anxious. That lovely Jewish guilt that comes with ancestry.

My serve can get better, for sure. It's not just about serving bombs, but positioning, variation in speed, in spin.