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The absurdity of life, according to Nagel, is due to “the collision between the seriousness with which we take our lives and the perpetual possibility of regarding everything about which we are serious as arbitrary, or open to doubt.”
Nagel: “If subspecie aeternitatis (L. lit. under the aspect of eternity; in its essential or universal form or nature) there is no reason to believe that anything matters, then that doesn’t matter either, and we can approach our absurd lives with irony instead of heroism or despair.”
Camus: “This world in itself is not reasonable, that is all that can be said. But what is absurd is the confrontation of this irrational and wild longing for clarity whose call echoes in the human heart.”