We must plan for freedom, and not only for security, if for no other reason than that only freedom can make security secure.

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.

For any marginalized group to change the story that society tells about them takes courage and perseverance.

You can only work on yourself. Start there.

A man is his tallest when he is down on his knees in prayer.

Happiness is experienced largely in striving towards a goal, not in having attained things, because our nature is always to want to go on to the next endeavor.

Like following life through creatures you dissect, You lose it in the moment you detect.

I don't consider myself a pariah.

It's time to begin righting the story of your life.

When you work in film, you learn to appreciate a distributor. You can have this great little film, but if you don't have a distributor, you are sitting in your living room with a great little film.

A man who is very busy seldom changes his opinions.

Don't let the cat out or the concierge in: this is the first principle of socialist ladies.