The difficulties connected with my criterion of demarcation (D) are important, but must not be exaggerated. It is vague, since it is a methodological rule, and since the demarcation between science and nonscience is vague....

But one must remember that they were all men with systems. Freud, monumentally hipped on sex (for which he personally had little use) and almost ignorant of Nature: Adler, reducing almost everything to the will...