Moreover, man during this period not only elaborates his brain plastically, but has to learn three most important things for his earthly existence. The first is the equilibrium of his own body in space. The man of the present day entirely overlooks the meaning of this statement, which touches upon one of the most essential differences between man and animals. An animal is destined from the outset to develop its equilibrium in space in a certain way; one animal is destined to be a climber, another a swimmer, etc. An animal is so organized from the beginning as to be able to bear itself rightly in space, and this is the case with all animals up to and including the mammals most resembling man. If zoologists would ponder this fact, they would lay less emphasis on the number of similar bones and muscles in man and animals, etc., for this is of much less account than the fact that man is not endowed at the outset with the complete equipment for his conditions of equilibrium. He has first to form them out of the sum total of his being. It is significant that man should have to work upon himself, in order to make, out of a being that cannot walk at all, one that can walk erect. It is man himself who gives himself his vertical position, or his equilibrium in space. He brings himself into relation with the force of gravitation. It will obviously be easy for anyone taking a superficial view of the matter to question this statement, with apparently good reason. It may be said that man is just as much organized for his erect walk as, for instance, a climbing animal for climbing. But more accurate observation will show that it is the peculiarity of the animal’s organization that causes its position in space. In man it is the soul which brings itself into relation with space and controls the organization.