It is truly commendable the effort of Unamuno to try to verbalize the feeling he experiences, perhaps discovered only after a careful look inside himself, that there is an indescribable force always present in the decisive moments of his life, in which he had to make decisions. Noticing it is not a simple task, and sometimes it is only possible when time passes, and the irreversible effects of the decision are drawn in the past. It is even more difficult to admit, since the evidence is concentrated in the nebulous field of subjectivity, which rejects the possibility of clear and rational understanding. The hardest thing, however, is to try to express it: words seem insufficient, never corresponding to the real feeling. To do so is necessarily to expose oneself to ridicule; it is to say something and then immediately want to take it back. Of all that can be said about Del sentimiento trágico de la vida, the most important thing is this: this book is a demonstration of courage.