We do not base botany upon the old-fashioned division into useful and useless plants, or our zoology upon the naive distinction between harmless and dangerous animals. But we still complacently assume that consciousness is sense and the unconsciousness is nonsense. In science such an assumption would be laughed out of court. Do microbes, for instance, make sense or nonsense? Whatever the unconscious may be, it is a natural phenomenon producing symbols that prove to be meaningful. We cannot expect someone who has never looked through a microscope to be an authority on microbes; in the same way, no one who has not made a serious study of natural symbols can be considered a competent judge in this matter. But the general undervaluation of the human soul is so great that neither the great religions nor the philosophies nor scientific rationalism have been willing to look at it twice.