Knowing whether or not man is free involves knowing whether he can have a master. The absurdity peculiar to this problem comes from the fact that the very notion that makes the problem of freedom possible also takes away all its meaning. For in the presence of God there is less a problem of freedom than a problem of evil. You know the alternative: either we are not free and God the all-powerful is responsible for evil. Or we are free and responsible but God is not all powerful. All the scholastic subtleties have neither added anything to nor subtracted anything from the acuteness of this paradox.

Soon after the event on 6 August 1945 he was one of the few French editors to publicly express opposition and disgust to the United States' dropping the atomic bomb in Hiroshima. His views contributed to the rise of the philosophy known as absurdism. To distinguish his ideas scholars sometimes refer to the Paradox of the Absurd when referring to "Camus's Absurd".

In an interview in 1945 Camus rejected any ideological associations: "No I am not an existentialist. Sartre and I are always surprised to see our names linked. In 1949 Camus founded the Group for International Liaisons within the Revolutionary Union Movement after his split with Garry Davis's Citizens of the World movement of which the surrealist André Breton was also a member.