I do not think, therefore I am a moustache - Jean-Paul Sartre

If existence really does precede essence, there is no explaining things away by reference to a fixed and given human nature, In other words, there is no determinism, man is free, man is freedom. On the other hand, if God does not exist, we find no values or commands to turn to which legitimize our conduct. So, in the bright realm of values, we have no excuses behind us, no justification before us. We are alone with no excuses.

This is the idea I shall try to convey when I say that man is condemned to be free. Condemned, because he did not create himself, yet in other respects is free; because once thrown into the world, he is responsible for everything he does.

Man cannot will unless he has first understood that he must count on no one but himself; that he is alone, abandoned on earth in the midst of his infinite responsibilities, without help, with no other aim than the one he sets himself, with no other destiny than the one he forges for himself on this earth.

We will freedom for freedom's sake, in and through particular circumstances. And in thus willing freedom, we discover that it depends entirely upon the freedom of others and that the freedom of others depends upon our own. Obviously, freedom as the definition of a man does not depend upon others, but as soon as there is a commitment, I am obliged to will the liberty of others at the same time as my own. I cannot make liberty my aim unless I make that of others equally my aim.