It is another great advantage of pantheism, Hartmann contends, that it can provide a foundation for ethics. Ethics, he insists, cannot be separated from metaphysics. An ethics without metaphysics simply “hangs in mid air” (84). Moral principles require that we surrender the claims of egoism, that an individual cease to put self-interest first, and that he or she recognize the equal claims of others. Pantheism satisfies this requirement, Hartmann argues, because it is a form of monism, according to which the identity of each individual is connected with that of everyone else, and according to which all particular individuals are really only one self (84, 116-17). One individual cannot harm another, then, without also harming his deeper and better self.