This has nothing to do with differences of opinion. Society profits from contrasting views, from discussion and struggle. The opposing parties in a real debate understand each other well and are working with the same logic and the same desire for order of thought. This contrast between order and mysticism has still less to do with the difference of knowledge and belief in a higher religious and philosophical sense. There is no real antagonism between science and religion, between experience and philosophical speculation. They point to each other, they demand each other, and no social question is involved when the interests of one man emphasize more the scholarly search for scientific truth, and those of another concentrate throughout his lifework on the emotional wisdom of religion. It is quite different with mysticism and science; they are not two parties of a debate on equal terms. They exclude each other, as the mystic projects his feeling interests into those objects which the scientist tries to analyze and to understand as effects of causes. Nothing is a safer test of the cultural development of a society than the instinct for the difference between religion and superstition. Mysticism is a systematized superstition. It never undermines the true interests of society more than when it goes to work with pseudo-scientific tools. Its most repellent form, that of sheer spiritualism, has in recent years declined somewhat, and the organizations for antilogical, psychical research eke out a pitiable existence nowadays. But the community of the silent or noisy believers in telepathy, mystical foresight, clairvoyance, and wonder workers seems to increase.