The care for the bare necessities of life, the inexorable struggle for existence, has aroused in mankind the desire for fellow-strugglers, for companions. In the tribe his power of resistance was increased, and his prospect of self-support grew in proportion as he developed together with his fellows into a new collective existence. But the fact that, notwithstanding this, he did not grow up like a mere animal in a flock, but in such a way that he always--even if often only after long and bitter experience--found his proper development in the tribe--this has made him a man and his tribe a society. Which is the more ancient and more sacred, the unfettered rights of the individual or the welfare of the community? Can anyone take this question seriously who is accustomed to look at the life and development of society in the light of facts? Individualism and Altruism are as inseparably connected as light and darkness, as day and night. The individualistic and the social sense in human society correspond to the centrifugal and centripetal forces in the universe, or to the forces of attraction and repulsion that govern molecular activity. Their movements must be regarded simply as manifestations of forces in the direction of the resultants, whose components are Individualism and Altruism. If, to use a metaphor from physics, one of these forces was excluded, the body would either remain stock-still, or would fly far away into infinity. But such a case is, in society as in physics, only possible in imagination, because the distinction between the two forces is itself only a purely mental separation of one and the same thing.