The root of all Ethic is to be found in the feeling or alogical side of our consciousness. The moral Trieb is an ultimate and irreducible factor in the psychic system into which it enters. This Trieb, this impulse, consists in the determination of the individual mind to motives of action outside the sphere of its own circle of interests qua individual, and, it may be, even incompatible with that circle of interests. But this irreducible potentiality of the "moral sense," regarded per se, is, for the thinker whose business it is to analyse the moral consciousness, no more than an abstraction. In order for it to become realised, it must acquire a determinate content, and it is almost needless to add that on the nature of this content the whole problem of Ethic, in the concrete, hinges."