From heuristics of fear to the love praxis. Moral-theological study about The Imperative of responsibility in Hans Jonas. The ethics of technology must not be considered simply according to its applicative phase but also according to its radical insufficiency, its teleological ambivalence, its dynamics of knowledge-power that increases more and more, and therefore, also according to its elucidative phase. Thus technology demands to be completed and to have its reference in a global anthropology wherein it can find its role besides the other dimensions of human being – essentially human, with the properly ambivalences and oppositions of the mystery of its liberty of which is part the experiences of fortune and misfortune, pleasure and pain, good and bad wherein the human epic unfolds in its history. The preservation of such essence constitutes the main duty of ethics and of theology to deal with responsibility and life. Herein is the justification to the moral-theological thinking that this thesis intends. The topic of this thesis wants to analyze the impact of tecnoscience and biotechnoscience progresses before the new human action. So Hans Jonas’ thinkings arise as outline approaches of this reality. From the main outlines in his thinking a moral-theological study will be done. Here is the great challenge to a study that detects the impasses, the possible alternatives, and the challenges that Christian good-news gives to a historically new world: make an urgent transition but very conscious, from the heuristics of fear to love praxis.