A clever person solves a problem. A wise person avoids it.

Put your hand on a hot stove for a minute, and it seems like an hour. Sit with a pretty girl for an hour, and it seems like a minute. That's relativity.

The world is a dangerous place to live, not because of the people who are evil, but because of the people who don't do anything about it.

Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution.

Reality is merely an illusion, albeit a very persistent one.

Science without religion is lame, religion without science is blind.

Computers are incredibly fast, accurate and stupid. Human beings are incredibly slow, inaccurate and brilliant. Together they are powerful beyond imagination.

Anyone who has never made a mistake has never tried anything new.

The search for truth is more precious than its possession.

You cannot simultaneously prevent and prepare for war.

It is harder to crack a prejudice than an atom.

This topic brings me to that worst outcrop of the herd nature, the military system, which I abhor. That a man can take pleasure in marching in formation to the strains of a band is enough to make me despise him. He has only been given his big brain by mistake; a backbone was all he needed. This plague-spot of civilisation ought to be abolished with all possible speed. Heroism by order, senseless violence, and all the pestilent nonsense that goes by the name of patriotism — how I hate them! War seems to me a mean, contemptible thing: I would rather be hacked in pieces than take part in such an abominable business.

If we knew what we were doing, it wouldn't be called research, would it?

It is my conviction that killing under the cloak of war is nothing but an act of murder.