[en] The author proposes a discussion about the notion of reversibility by using the policy theory and by referring to philosophical and political texts written, for example, by Jankelevitch, Castoriadis, Merleau-Ponty, Thucydide or Arendt. He first discusses this notion with respect to irreversibility, notably as it appears in Jankelevitch's works. Then, by referring to an example chosen in the antiquity, he discusses re-examination as a first example of reversibility. He discusses three figures that the notion of reversibility may have in policy: forgetting, forgiving and recollecting. The first ones tend to put something aside. The last one is a struggle against forgetting