In this book, the author attempts to examine the question of 'the same and the other' in the joint works of M. de Unamuno and A. Machado, two authors equally enamoured with literature, who explored philosophy in the strict sense of the word. Two authors, M. de Unamuno (1864-1936) and A. Machado (1875-1939), both of Spanish origin, were world-renowned authors. M. de Unamuno was from Salamanca and A. Machado was from Seville, both members of the '1898 Generation'.