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It is maintained by Jung that there is in every organism one single fundamental energy which has various manifestations. This concept is based on an analogy drawn from physical science. Physical energy has various forms, appearing now as heat, now as movement, now as light, now as electricity, now as a chemical change. But at bottom it is all one and the same energy, and must, in the last analysis, be looked upon as that which moves a mass with a given velocity. So Jung sees in the various strivings of a human being, whether for the pleasures of the sense or of the mind, whether noble or ignoble, whether as a child or as a man, the manifestations of one and the same psychical energy, the libido of the organism.
It has long seemed to me that one must admit that there is in human nature a driving force which, however Protean its forms, never loses its identity. At the same time it appears also that this driving force does not exhaust the kinetic apparatus of our nature. The two steeds in Plato's chariot may have to be reduced to one that has good moods and bad moods, that may at times move along quietly, with a dignified and noble bearing; and then again dash ahead and threaten to wreck the chariot and kill the charioteer. But whether leisurely or with dash and spirit the one horse always moves and when he is moving his head must always be pointed to some of the many points of the compass, and in the normal human being, there is some kind of guidance and control which is being exercised over his movements.