As for Adler, I was much impressed by a personal experience. Once, in 1919, I reported to him a case which to me did not seem particularly Adlerian, but which he found no difficulty in analyzing in terms of his theory of inferiority feelings, although he had not even seen the child. Slightly shocked, I asked him how he could be so sure. 'Because of my thousandfold experience,' he replied; whereupon I could not help saying: 'And with this new case, I suppose, your experience has become thousand-and-one-fold.'

It seems to me certain that more people are killed out of righteous stupidity than out of wickedness.

I may illustrate this by two very different examples of human behaviour: that of a man who pushes a child into the water with the intention of drowning it; and…

It is often asserted that discussion is only possible between people who have a common language and accept common basic assumptions. I think that this is a mis…

The great extension of our experience in recent years has brought light to the insufficiency of our simple mechanical conceptions and, as a consequence, has sh…

It is also a good rule not to put overmuch confidence in the observational results that are put forward until they are confirmed by theory.

Whether you can observe a thing or not depends on the theory which you use. It is the theory which decides what can be observed.