There is no history of mankind, there is only an indefinite number of histories of all kinds of aspects of human life.

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.

There is a fundamental difference between religion, which is based on authority, and science, which is based on observation and reason. Science will win because it works.

Your heart is a conduit through which the spirit speaks to the mind.

War is a ritual, a deadly ritual, not the result of aggressive self-assertion, but of self-transcending identification. Without loyalty to tribe, church, flag or ideal, there would be no wars.

But human borders mean nothing to air, water, windblown soil or seeds or migrating fish, birds or mammals.

How strange a thing is death, bringing to his knees, bringing to his antlers The buck in the snow . . . Life, looking out attentive from the eyes of the doe.

I think the best way it happens is if parents say, this is important for educating my child.

And in 'Frisco Kid' and in 'The Woman in Red' I had to ride badly. Then you have to really ride well in order to ride badly.

For me, once I've worked on something and it's finished, it's like an ex-boyfriend: you don't go back to them.

The fashion world is very active and generous, despite the fact that it is not very well respected - or at least not as much as it should be.

It is always the same with mountains. Once you have lived with them for any length of time, you belong to them. There is no escape.