If we are to be morally and ethically responsible, there can be no turning back once we find, as we have found, that some of the most basic presuppositions of these values are mistaken. Playing God is indeed playing with fire. But that is what we mortals have done since Prometheus, the patron saint of dangerous discoveries. We play with fire and take the consequences, because the alternative is cowardice in the face of the unknown.

Ronald Dworkin, Sovereign Virtue, Cambridge, Massachusetts, 2000, p. 446