Contemporary bio-ethics shares with the ancient tradition of natural theology the characteristic of assuming, in the face of the advances of a fundamentally materialist science, an opportunistic function, which is that of the adaptive rescue of spiritual values. Bioethical humanism exists only in the process of this perpetual movement of repossession, and its effort, established to this effect, leads back incoherently to the interminable dualistic confrontation between science and conscience, having failed to take upon itself the task of constructing a rationally-informed thinking on the relationships between the order of development of positive knowledge and the order of development of moral feelings, both in human evolution and in the history of societies. These matters hardly concern today's fashionable philosophers, whose dominant preoccupation seems to be to find a still-unfilled job - something between an esoteric magus and a preacher in vogue - on the great stage of the inessential upon which inconsequential thought is exhibited.