If it can't be expressed in figures, it is not science; it is opinion. It has long been known that one horse can run faster than another - but which one? Differences are crucial.

I don't trust a man who talks about ethics when he is picking my pocket. But if he is acting in his own self-interest and says so, I have usually been able to …

If men were the automatons that behaviorists claim they are, the behaviorist psychologists could not have invented the amazing nonsense called 'behaviorist psy…

Human beings hardly ever learn from the experience of others. They learn; when they do, which isn't often, on their own, the hard way.

I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot express it in nu…

I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot express it in nu…

But man has still another powerful resource: natural science with its strictly objective methods.