The idea that ethical nature, though born of cosmic nature, is necessarily at enmity with it is a fundamental truth

All I have endeavoured to do, at present, is to remove that which seems to have proved a stumbling-block to many—namely, the apparent paradox that ethical nature, while born of cosmic nature, is necessarily at enmity with its parent. Unless the arguments set forth in the Prolegomena, in the simplest language at my command, have some flaw which I am unable to discern, this seeming paradox is a truth, as great as it is plain, the recognition of which is fundamental for the ethical philosopher.