We have an inborn tendency to establish types in our minds and to divide mankind according to them. [But] however advantageous and revealing such categories may be, no matter whether they spring from purely personal experience or from attempting a scientific establishment of types, at times it is a good and fruitful exercise to take a cross section of experience in another way and discover that each person bears traces of every type within himself and that diverse characters and temperaments can be found as alternating characteristics within a single individual. Hesse Notes
