The book opens with a tribute to the recently deceased San Diego anthropologist Marcel Hénaff, and a review of his two major works: Le prix de la vérité, and Le don des philosophes, both published by Editions du Seuil, in 2002 and 2012. For me, the purpose of this essay has been to "rethink reciprocity", in a spirit of sincerity, and based on this definition of philosophy: a series of attitudes of thought towards men and the world. My first question concerns the static nature of thought, from traditional societies and the philosophy of the Presocratics to the return of movement and flux in contemporary times, with Whitehead, Bergson and Deleuze. How can we regain the essential force of continuous movement, which turned the "fixed" forms between which it vibrated into poles of secondary importance? How is it, my second question, that the upheaval then affecting thought has left only minimal traces in the peaceful course that Philosophy appears to us to be? I'm trying to show that the spirit of domination and individual accumulation, pure antitheses of reciprocity, were its gravediggers.