The thinking, feeling and willing faculties of human nature have to be developed and refined before they can give some measure of the higher satisfaction and happiness--but by themselves and left to their competing selves they cannot give the full measure and perfect quality of these twin rewards. They need to be integrated to be brought harmoniously together, put in their proper place and ruled by another faculty operating on a level above them. Such a one is the intuition.
-- Notebooks Category 20: What Is Philosophy? > Chapter 3: Its Requirements > # 265