Maurice Blondel is the most fruitful metaphysician and most decisive in the history of human thought. This book, lively symbiosis of thought of the master, is hidden by the imposing and breathtaking cathedral that is his tetralogy (Thought. In 2 volumes, and be the beings action. 2 vols., Philosophy and Christian mind) and not his writings The first letter on the requirements of contemporary thought in matters of apologetic (1896), history and dogma, its "apologetic" writes circumstance that does qu'émoustiller historians ideas, always late, if not stopped. Specifically, Blondel shows that action is never fully share; the experience is never fully passivity. By its method of immanence, that the close Thomists confused with immanentism, or worse, ontologism, the "philosopher of Aix" passes this turning point in legitimizing the consistency of the Christian supernatural. The normative, vinculum vital that action is in us, working in a cycloid movement, between the will voulante, first line, and the necessary will, ours. This "yes" to the assumptive and original life, opening the inexhaustible mystery of charity, overlooking the modernist crisis and comes to offer to the philosophy "practicing" and beings of "good will" the key to union with God, according to a creation in action. For eternity.