What the sorrowful Jew of Amsterdam called the essence of a thing, the effort that it makes to persist indefinitely in its own being, self-love, the longing for immortality, is it not perhaps the primal and fundamental condition of all reflective or human knowledge? And is it not therefore the true base, the real starting-point, of all philosophy, although the philosophers, perverted by intellectualism, do not recognize it?

The Tragic Sense of Life (1913) - II : The Starting-Point