Section — McHugh–Callan, Moral Theology
Introduction
812.
(Summa Theologica, II-II, qq. 10-15.)
The sins against faith can all be reduced to four heads: (a) sins of unbelief (see 813-886), which are opposed to the internal act of faith; (b) sins of blasphemy (see 887-903), which are opposed to the external act of faith; (c) sins of ignorance (see 904-911), which are opposed to the Gift of Knowledge; (d) sins of blindness and dullness (912), which are opposed to the Gift of Understanding.