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 it is more than sharp enough to make a distinction between many physical theories on the one hand, and metaphysical theories, such as psychoanalysis, or Marxism (in its present form), on the other. This is, of course, one of my main theses; and nobody who has not understood it can be said to have understood my theory.The situation with Marxism is, incidentally, very different from that with psychoanalysis. Marxism was once a scientific theory: it predicted that capitalism would lead to increasing misery and, through a more or less mild revolution, to socialism; it predicted that this would happen first in the technically highest developed countries; and it predicted that the technical evolution of the 'means of production' would lead to social, political, and ideological developments, rather than the other way round.But the (so-called) socialist revolution came first in one of the technically backward countries. And instead of the means of production producing a new ideology, it was Lenin's and Stalin's ideology that Russia must push forward with its industrialization ('Socialism is dictatorship of the proletariat plus electrification') which promoted the new development of the means of production.Thus one might say that Marxism was once a science, but one which was refuted by some of the facts which happened to clash with its predictions (I have here mentioned just a few of these facts).However, Marxism is no longer a science; for it broke the methodological rule that we must accept falsification, and it immunized itself against the most blatant refutations of its predictions. Ever since then, it can be described only as nonscience—as a metaphysical dream, if you like, married to a cruel reality.Psychoanalysis is a very different case. It is an interesting psychological metaphysics (and no doubt there is some truth in it, as there is so often in metaphysical ideas), but it never was a science. There may be lots of people who are Freudian or Adlerian cases: Freud himself was clearly a Freudian case, and Adler an Adlerian case. But what prevents their theories from being scientific in the sense here described is, very simply, that they do not exclude any physically possible human behaviour. Whatever anybody may do is, in principle, explicable in Freudian or Adlerian terms. (Adler's break with Freud was more Adlerian than Freudian, but Freud never looked on it as a refutation of his theory.)The point is very clear. Neither Freud nor Adler excludes any particular person's acting in any particular way, whatever the outward circumstances. Whether a man sacrificed his life to rescue a drowning, child (a case of sublimation) or whether he murdered the child by drowning him (a case of repression) could not possibly be predicted or excluded by Freud's theory; the theory was compatible with everything that could happen—even without any special immunization treatment.Thus while Marxism became non-scientific by its adoption of an immunizing strategy, psychoanalysis was immune to start with, and remained so. In contrast, most physical theories are pretty free of immunizing tactics and highly falsifiable to start with. As a rule, they exclude an infinity of conceivable possibilities.
It is the fate of great achievements, born from a way of life that sets truth before security, to be gobbled up by you and excreted in the form of shit. For centuries great, brave, lonely men have been telling you what to do. Time and again you have corrupted, diminished and demolished their teachings; time and again you have been captivated by their weakest points, taken not the great truth, but some trifling error as your guiding principal. This, little man, is what you have done with Christianity, with the doctrine of sovereign people, with socialism, with everything you touch. Why, you ask, do you do this? I don't believe you really want an answer. When you hear the truth you'll cry bloody murder, or commit it. … You had your choice between soaring to superhuman heights with Nietzsche and sinking into subhuman depths with Hitler. You shouted Heil! Heil! and chose the subhuman. You had the choice between Lenin's truly democratic constitution and Stalin's dictatorship. You chose Stalin's dictatorship. You had your choice between Freud's elucidation of the sexual core of your psychic disorders and his theory of cultural adaptation. You dropped the theory of sexuality and chose his theory of cultural adaptation, which left you hanging in mid-air. You had your choice between Jesus and his majestic simplicity and Paul with his celibacy for priests and life-long compulsory marriage for yourself. You chose the celibacy and compulsory marriage and forgot the simplicity of Jesus' mother, who bore her child for love and love alone. You had your choice between Marx's insight into the productivity of your living labor power, which alone creates the value of commodities and the idea of the state. You forgot the living energy of your labor and chose the idea of the state. In the French Revolution, you had your choice between the cruel Robespierre and the great Danton. You chose cruelty and sent greatness and goodness to the guillotine. In Germany you had your choice between Goring and Himmler on the one hand and Liebknecht, Landau, and Muhsam on the other. You made Himmler your police chief and murdered your great friends. You had your choice between Julius Streicher and Walter Rathenau. You murdered Rathenau. You had your choice between Lodge and Wilson. You murdered Wilson. You had your choice between the cruel Inquisition and Galileo's truth. You tortured and humiliated the great Galileo, from whose inventions you are still benefiting, and now, in the twentieth century, you have brought the methods of the Inquisition to a new flowering. … Every one of your acts of smallness and meanness throws light on the boundless wretchedness of the human animal. 'Why so tragic?' you ask. 'Do you feel responsible for all evil?' With remarks like that you condemn yourself. If, little man among millions, you were to shoulder the barest fraction of your responsibility, the world would be a very different place. Your great friends wouldn't perish, struck down by your smallness.