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La agonía del cristianismo (philosophical essay) and San Manuel bueno martir (novel), among others, where he treats him in his own way. Greetings.Hello, @oryans.belt. *Of the tragic feeling of life is one of the books where Unamuno addresses this complex subject, but from philosophy and literature, not from theology, of course. Unamuno was a writer with a very controversial conception on various topics, including on belief, faith, God, and so on. He has books such as