To be capable of everything and do justice to everything, one certainly does not need less spiritual force and èlan and warmth, but more. What you call passion is not spiritual force, but friction between the soul and the outside world. Where passion dominates, that does not signify the presence of greater desire and ambition, but rather the misdirection of these qualities toward an isolated and false goal, with a consequent tension and sultriness in the atmosphere. Those who direct the maximum force of their desires toward the center, toward true being, toward perfection, seem quieter than the passionate souls because the flame of their fervor cannot always be seen.
From The Glass Bead game by Hermann Hesse