How is isolation exemplified in The Wall by Sartre?

Presented in the theories of the philosophers G. W. F. Hegel and Karl Marx, alienation is described as a state of divided selfhood in which a person is distanced from his or her true being. Pablo experiences a sense of alienation once he finds out he is condemned to death. The first indication of this change in perception comes when he realizes that, instead of being cold in the drafty cell, he is actually sweating. He runs his fingers through his hair, surprised to find it stiff with sweat. He reflects that he must have been sweating for the past hours, yet he "had felt nothing."

Later he comes to view it almost as if it was someone else's body; "it was no longer I," he thinks. As the hours pass, Pablo also grows alienated from his consciousness, which includes the people and ideals that he once found of the utmost importance. He finds that nothing matters to him anymore, not the anarchist movement, not freedom, not his girlfriend. Pablo feels increasingly "inhuman," a state that again denotes his alienation from the other men that surround him, from society, and from his own former self.