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To present an approach that takes into account Christian and human action in their unity to establish a fundamental moral theology in dialogue with philosophical thought to revisit secular ethics under the momentum of faith: René Simon's work has evolved around these three axes. Far from shutting off theological reflection from the world, Simon always believed in opening it up to other disciplines (philosophy, sociology. etc.). He was convinced that only in relation to a certain otherness could theological reflection forge its identity and develop coherent ideas be a simultaneous testimony to its interaction with reality and its critical force, or the subversive memory of the Gospel. Simon's contribution is clearly visible in that movement: the opening of frontiers - also adopted by a fundamental and deep ecumenism - the desire to be a ‘passer', to break down barriers with respect, to plunge one's root into a tradition without becoming its slave, yet to find the force to live one's freedom and bear witness, showing respect for the other. Such moral theology is possible only if it is constructed around faith in man, and faith in Christ and because it takes the incarnation seriously. This book, directed by Denis Müller and Eric Gaziaux - both successors to René Simon at the presidency of ATEM - assembles the theologian's principle texts published between 1970 - 2000 in reviews and multi-author works.