No number of sightings of white swans can prove the theory that all swans are white. The sighting of just one black one may disprove it.

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.

If you want to feel the sunshine, change position!

Nature is neutral.

Eighty to 90 percent of success in a company has nothing to do with business at all - it's all personal.

Innovation simply isn't as unpredictable as many people think. There isn't a cookbook yet, but we're getting there.

In the future, fortune could well favor those who didn't sell their good domain names too cheaply, or too boldly

Not loving is a letting go. Listen, The terrain around here Is Far too Dangerous For That.

Nature will castigate those who don't masticate.

I think Christians should be leaders in art, science, philanthropy, charity, and all kinds of good works. We should be good examples for everyone. Unfortunately though, that's not often the case.

I don't think a woman [Hillary Clinton] who has revealed numerous classified information, doesn't know that the letter "C" means confidential.

If you played the game the right way, played the game for the team, good things would happen