Quote

You have to test your hypothesis against other theories. Certainty in the face of complex situations is very dangerous.

To the extent that you can find ways where you're making predictions, there's no substitute for testing yourself on real-world situations that you don't know the answer to in advance.

The materialistic point of view in psychology can claim, at best, only the value of an heuristic hypothesis.

Good tests kill flawed theories; we remain alive to guess again.

There can be theory but, you know, the problem is you've got to be able to test it. So theories are one thing, testing is another.

You have to trust yourself, not research. Not testing. Testing helps, but you have to trust your own taste. If your taste says something isn't any good, don't let research rationalize that out of its own truth.

If the facts are contrary to any predictions, then the hypothesis is wrong no matter how appealing.

It is a test of true theories not only to account for but to predict phenomena.