/summa/TP/TPIII/TP_Q85:
We must now consider penance as a virtue, under which head there are six points of inquiry:
(1) Whether penance is a virtue?
(2) Whether it is a special virtue?
(3) To what species of virtue does it belong?
(4) Of its subject;
(5) Of its cause;
(6) Of its relation to the other virtues.