973. CONCERNING THE SPHERES OF THE ACTIVITY OF SPIRITS AND ANGELS Around spirits, and especially around angels, there are not only spheres of activity, or of forces, which, as in corporeal things, are the modifications of substances, but there are also spheres of all affections both spiritual and celestial. Moreover, these spheres are changed exactly according to their changes of state; but, still, all states refer themselves to that one which is their proper state.