Philosophy brings the knowledge of the "I" as it really is (in the deepest sense) into the consciousness of a man. Mysticism does the same. How could anything higher be realized by any human, concerning things human, than what is taught in both these fields? Then what more does philosophy offer? It offers a fuller result and completes the work by including the world.
-- Notebooks Category 20: What Is Philosophy? > Chapter 4: Its Realization Beyond Ecstasy > # 128