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 La agonía del cristianismo (philosophical essay) and San Manuel bueno martir (novel), among others, where he treats him in his own way. Greetings.