Observing current trends in moral theology, especially in the field of bioethics, has long raised both the methodological and meritorious problem of obscuring or even removing the boundaries between good and evil. Divergence and contradiction have become a strange scientific standard in theological-moral discourse in the derivation of Hegel’s synthesis on fundamental moral questions. Depositum fidei morale, which is based on the Decalogue, Lex aeterna, and lex naturalis, seems to be giving way to post-Christian Wittgenstein language-games, in which the clear line between good and evil (including truth and falsehood), determined by the transcendent Authority of God, has been relativized. The reflection of the relationship between the norm and conscience, as well as the relationship between good and evil, in the light of the Thomistic philosophical-theological patrimony, seeks to point to the need of accepting an adequate logical re-examination of the ethical analysis of a human act. Without this, it is impossible to continue not only in Traditio, but also in finding a universal reference point for distinguishing between good and evil in the complicated world of contemporary bioethics, which responds to revolutionary biotechnologies in the field of biomedicine.