We should therefore claim, in the name of tolerance, the right not to tolerate the intolerant.

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.

I would rather fail doing God's work than have a pseudo-victory being co-opted by someone else.

We need to get acquainted with mediocrity to notice greatness.

Envy comes from people's ignorance of or lack of belief in their own gifts.

The right server for the right job.

I have no known marketable skills.

Of all evil I deem you capable: Therefore I want good from you. Verily, I have often laughed at the weaklings who thought themselves good because they had no claws.

The amount of stress in your life is determined by how much energy you expend resisting your life.

Laugh often, long and loud. Laugh until you gasp for breath.

Every physician almost hath his favourite disease.

There cannot be any greater challenge to the law than trying to adjudicate mass crimes like war crimes.