This justification, though open upon the entire universe through time and space, will always be finite. Whatever one may do, one never realizes anything but a limited work, like existence itself which tries to establish itself through that work and which death also limits. It is the assertion of our finiteness which doubtless gives the doctrine which we have just evoked its austerity and, in some eyes, its sadness. As soon as one considers a system abstractly and theoretically, one puts himself, in effect, on the plane of the universal, thus, of the infinite. That is why reading the Hegelian system is so comforting. I remember having experienced a great feeling of calm on reading Hegel in the impersonal framework of the Bibliotheque Nationale in August 1940. But once I got into the street again, into my life, out of the system, beneath a real sky, the system was no longer of any use to me: what it had offered me, under a show of the infinite, was the consolations of death; and I again wanted to live in the midst of living men. I think that, inversely, existentialism does not offer to the reader the consolations of an abstract evasion: existentialism proposes no evasion. On the contrary, its ethics is experienced in the truth of life, and it then appears as the only proposition of salvation which one can address to men. Taking on its own account Descartes’ revolt against the evil genius, the pride of the thinking reed in the face of the universe which crushes him, it asserts that, despite his limits, through them, it is up to each one to fulfill his existence as an absolute. Regardless of the staggering dimensions of the world about us, the density of our ignorance, the risks of catastrophes to come, and our individual weakness within the immense collectivity, the fact remains that we are absolutely free today if we choose to will our existence in its finiteness, a finiteness which is open on the infinite. And in fact, any man who has known real loves, real revolts, real desires, and real will knows quite well that he has no need of any outside guarantee to be sure of his goals; their certitude comes from his own drive. There is a very old saying which goes: “Do what you must, come what may.” That amounts to saying in a different way that the result is not external to the good will which fulfills itself in aiming at it. If it came to be that each man did what he must, existence would be saved in each one without there being any need of dreaming of a paradise where all would be reconciled in death.
—Simone de Beauvoir, "The Ethics of Ambiguity"