/summa/FP/FPVII/FP_Q51:
We next inquire about the angels in comparison with corporeal things; and in the first place about their comparison with bodies; secondly, of the angels in comparison with corporeal places; and, thirdly, of their comparison with local movement.
Under the first heading there are three points of inquiry:
(1) Whether angels have bodies naturally united to them?
(2) Whether they assume bodies?
(3) Whether they exercise functions of life in the bodies assumed?