Who, then, can prove that I am the proper person to impose, by my own choice, my conception of man upon mankind? I shall never find any proof whatever; there will be no sign to convince me of it. If a voice speaks to me, it is still I myself who must decide whether the voice is or is not that of an angel. If I regard a certain course of action as good, it is only I who choose to say that it is good and not bad. … When, for instance, a military leader takes upon himself the responsibility for an attack and sends a number of men to their death, he chooses to do it and at bottom he alone chooses. No doubt under a higher command, but its orders, which are more general, require interpretation by him and upon that interpretation depends the life of ten, fourteen or twenty men. In making the decision, he cannot but feel a certain anguish. All leaders know that anguish. It does not prevent their acting, on the contrary it is the very condition of their action, for the action presupposes that there is a plurality of possibilities, and in choosing one of these, they realize that it has value only because it is chosen. Now it is anguish of that kind which existentialism describes, and moreover, as we shall see, makes explicit through direct responsibility towards other men who are concerned. Far from being a screen which could separate us from action, it is a condition of action itself.
And when we speak of “abandonment” – a favorite word of Heidegger – we only mean to say that God does not exist, and that it is necessary to draw the consequences of his absence right to the end. ….
The existentialist, on the contrary, finds it extremely embarrassing that God does not exist, for there disappears with Him all possibility of finding values in an intelligible heaven. …. For if indeed existence precedes essence, one will never be able to explain one’s action by reference to a given and specific human nature; in other words, there is no determinism – man is free, man is freedom. Nor, on the other hand, if God does not exist, are we provided with any values or commands that could legitimize our behavior. Thus we have neither behind us, nor before us in a luminous realm of values, any means of justification or excuse. – We are left alone, without excuse. That is what I mean when I say that man is condemned to be free. Condemned, because he did not create himself, yet is nevertheless at liberty, and from the moment that he is thrown into this world he is responsible for everything he does. ….