“It is indeed impossible to imagine our own death,” Sigmund Freud wrote in 1915, “and whenever we attempt to do so, we can perceive that we are in fact still present as spectators. Hence the psychoanalytic school could venture on the assertion that, at bottom, no one believes in his own death, or to put the same thing another way, that, in the unconscious, every one of us is convinced of his own immortality.”
― Sigmund Freud, Thoughts for the Times on War and Death (free online)