Serious rational criticism is so rare that it should be encouraged. Being too ready to defend oneself is more dangerous than being too ready to admit a mistake.

True ignorance is not the absence of knowledge, but the refusal to acquire it.

The growth of knowledge depends entirely upon disagreement.

In so far as a scientific statement speaks about reality, it must be falsifiable; and in so far as it is not falsifiable, it does not speak about reality.

The question is not how to get good people to rule; THE QUESTION IS: HOW TO STOP THE POWERFUL from doing as much damage as they can to us.

If you can't say it simply and clearly, keep quiet, and keep working on it till you can.

The best thing that can happen to a human being us to find a problem, to fall in love with that problem, and to live trying to solve that problem, unless another problem even more lovable appears.

Ignorance is not a simple lack of knowledge but an active aversion to knowledge, the refusal to know, issuing from cowardice, pride, or laziness of mind.

A theory which is not refutable by any conceivable event is non-scientific. Irrefutability is not a virtue of a theory (as people often think) but a vice.

I may be wrong and you may be right, and by an effort, we may get nearer to the truth

The attempt to make heaven on earth invariably produces hell.

Perhaps you should put your head down.” I knew this was the thing to do, although I’ve never fainted and I don’t intend to.

The problem is, of course, that these interest groups are all asking for changes, but their enthusiasm for change rapidly disappears when it affects the core of their own interests.

A house without books is a poor house, even if beautiful rugs are covering its floors and precious wallpapers and pictures cover its walls

There is nothing as unreal as life.

Christ used death to destroy death.

I'd always had a big thing for the '60s.

Be suspicious of any work that is not building product or getting customers. It's easy to get sucked into an infrastructure rewrite death spiral.

I think there's a prototype we're all looking for, whether it's Brett Favre or Troy Aikman. And everyone's got that picture in their mind of the prototype at the position.

Find what is it that never sleeps and never wakes, and whose pale reflection is our sense of 'I'

I have never done a stroke of work in my life.