Unamuno y el cristianismo. Voluntad de creer

This article describes and analyzes the relationship between the Unamuno´s thought and the Christianity. We expose the intellectual evolution of this controversial writer from the first phase of socialism until the later phase after his spiritual crisis of 1897. We highlighted his uncertainty about survival beyond death and his conscience of that to have to die cause the tragic sense of life. In Unamuno the passion for being, the hunger for immortality and the struggle for the meaning of existence is a creative pessimism that gives us a source of deserved hope, morality, kindness, compassion and love. We discuss the importance of spirituality for Unamuno, his desire of believe, his wish of faith, his anguish and his polemic orthodoxy.