"Every man transcends himself. But it happens that this transcendence is condemned to fall uselessly back upon itself because it is cut off from its goals. That is what defines a situation of oppression. Such a situation is never natural: man is never oppressed by things; in any case, unless he is a naive child who hits stones or a mad prince who orders the sea to be thrashed, he does not rebel against things, but only against other men. The resistance of the thing sustains the action of man as air sustains the flight of the dove; and by projecting himself through it man accepts its being an obstacle; he assumes the risk of a setback in which he does not see a denial of his freedom. The explorer knows that he may be forced to withdraw before arriving at his goal; the scientist, that a certain phenomenon may remain obscure to him; the technician, that his attempt may prove abortive: these withdrawals and errors are another way of disclosing the world."