Although anchored on the left, he missed May 68 by preferring literature to ideological debates. The readings he made at Éditions Gallimard around 1971/1972 gave him the opportunity to meet Raymond Aron. If he did not become a disciple, the latter led him to detach himself very quickly from a Marxism to which readings had led him to adhere. And he defined himself as Spinozo-nietzschean when, in 1973, he became assistant to Maurice Duverger at the Sorbonne.