Even Diotima and Amheim were shy of using it without a modifier, for it is still possible to speak of having a great, noble, craven, daring, or debased soul, but to come right out with "my soul" is something one simply cannot bring oneself to do. It is distinctly anolder person's word, and this can only be understood by assuming that in the course of life people become more and more aware of something for which they urgently need a name they cannot find until they finally resort, reluctantly, to the name they had originally despised. How to describe it, then? Whether one is at rest or in motion, what matters is not what lies ahead, what one sees, hears, wants, takes, masters. It forms a horizon, a semicircle before one, but the ends of this semicircle are joined by a string, and the plane of this string goes right through·the middle of the world. In front, the face and hands look out of it; sensations and strivings run ahead of it, and no one doubts that whatever one does·is always reasonable, or at least passionate. In other words, outercircumstances call for us to act in a way everyone can understand; and if, in the toils of passion, we do something incomprehensible, that too is, in its own way, understandable.
Robert Musil, The Man Without Qualities: Vol. 1
passion, reason, soul