/summa/SS/SSI/SS_Q5:
We must now consider those who have faith: under which head there are four points of inquiry:
(1) Whether there was faith in the angels, or in man, in their original state?
(2) Whether the demons have faith?
(3) Whether those heretics who err in one article, have faith in others?
(4) Whether among those who have faith, one has it more than another?