A failure is not always a mistake, it may simply be the best one can do under the circumstances. The real mistake is to stop trying. - B. F. Skinner

Twenty-five hundred years ago it might have been said that man understood himself as well as any other part of his world. Today he is the thing he understands least. Physics and biology have come a long way, but there has been no comparable development of anything like a science of human behavior. Greek physics and biology are now of historical interest only (no modern physicist or biologist would turn to Aristotle for help), but the dialogues of Plato are still assigned to students and cited as if they threw light on human behavior. Aristotle could not have understood a page of modern physics or biology, but Socrates and his friends would have little trouble in following most current discussions of human affairs. And as to technology, we have made immense strides in controlling the physical and biological worlds, but our practices in government, education, and much of economics, though adapted to very different conditions, have not greatly improved. We can scarcely explain this by saying that the Greeks knew all there was to know about human behavior. Certainly they knew more than they knew about the physical world, but it was still not much. Moreover, their way of thinking about human behavior must have had some fatal flaw. Whereas Greek physics and biology, no matter how crude, led eventually to modern science, Greek theories of human behavior led nowhere. If they are with us today, it is not because they possessed some kind of eternal verity, but because they did not contain the seeds of anything better.

The amateur doesn't appreciate the need for experimentation. He wants his experts to know.

Man's power appears to have increased out of all proportion to his wisdom. He has never been in a better position to build a healthy, happy, and productive world; yet things have perhaps never seemed so black.