There is no pure, disinterested, theory-free observation.

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.

It's the problem with having a logical mind and giving women the same credit for ability as men, he mused as he dismounted. You can't contrive reasons to keep them safe.

The most luxurious home is the most peaceful one.

I am slow to learn and slow to forget that which I have learned. My mind is like a piece of steel, very hard to scratch any thing on it and almost impossible after you get it there to rub it out.

In general, those who defend capitalism are basically out of touch with reality.

A work of art is a world in itself reflecting senses and emotions of the artist's world.

Success is usually earned by persevering and not becoming discouraged when we encounter challenges.

You must be interested in finding the best way, not in having your own way.

If you've got to get fired, it's really fabulous to get fired with a friend.

It's never too early to panic.

Give your kids responsibility. Once outside, let them lead, who cares if you get lost; it might be the best trip you've ever had.