Immersed in reading Percy it has become blindingly clear that these two writers have such similar concerns. de Unamuno’s the Tragic Sense of Life rates as having made the most profound of impressions upon me — and that was going on thirty years ago. Whatever else separates Percy and de Unamuno, it is my view that de Unamuno and Percy are kindred spirits, more so than Flannery O’Connor and Percy. Here is a good and recent essay on the Tragic Sense of Life. For my “Precyeana” see here.