During the Jewish celebration of Passover, the youngest of the assembly has to request: "When these events did take place? " The oldest one answers: "It was tomorrow." A manner of affirming the singularity of the human being which, to survive and grow, must unceasingly cross new passages, without disavowing its past. But is a future still possible, when reality was desacralisee, when the threats are increasingly precise, when also we think of being able to create a new humanity? We should not hesitate to pose the thresholds of sacred where our ignorance starts, in order to reserve a space of freedom to us. Without it, our humanity would be likely to disappear, without a future. [ABSTRACT FROM AUTHOR]