Nietzsche's break with Schopenhauer rests on precisely this point; it is a matter of knowing whether the will is unitary or multiple.
Gilles DeleuzeThe morality of customs,the spirit of the laws, produces the man emancipated from the law.
Gilles DeleuzeExternal images act on me, transmit movement to me, and I return movement: how could images be in my consciousness since I am myself image, that is, movement?
Gilles DeleuzeThe law is not known, since there is nothing in it to know. We come across it only through its action, and it acts only through its sentence and its execution. It is not distinguishable from the application. We know it only through its imprint on our heart and our flesh: we are guilty, necessarily guilty. Guilt is like the moral thread which duplicates the thread of time.
Gilles Deleuze