I am opposed to looking upon logic as a kind of game. ... One might think that it is a matter of choice or convention which logic one adopts. I disagree with this view.

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.

All right, we need a way to get into the palace. Any ideas?""Ask nicely? Charge in? Fly? Wait, do you mean reasonable ones?

If everyone realized the value of life, the world would be peaceful. The meaning of these words, "Do unto others as you would have them, do unto you, " would be understood: It would be practiced.

We'll teach it that the humblest insect measuring out its miserable days by the pug-wuggery and skull duggery of the old Slug of Time is worth far more than this defecating bubble!

Leaders can hold onto busyness like a weapon of protection.

I never think too far into the future. I'm too busy thinking about tomorrow's news.

Hardships can harden even the best person.

At my house I have a full-size time machine that I’ve built over a couple of years... I love looking at people’s faces when they walk into my office. They’re literally astounded.

I think there is limits to the assumption that wherever you are, the situation in a way tells you how to behave.

If you go out for a drink, you go out for a drink. You don't think, 'I'll have a few pints. I'll piss up this shrine.'

I will venture to go... but remember that you must hold the ropes.