/summa/XP/XPII/XP_Q6:
We must now consider confession, about which there are six points for our consideration: (1) The necessity of confession; (2) Its nature; (3) Its minister; (4) Its quality; (5) Its effect; (6) The seal of confession.
Under the first head there are six points of inquiry:
(1) Whether confession is necessary for salvation?
(2) Whether confession is according to the natural law?
(3) Whether all are bound to confession?
(4) Whether it is lawful to confess a sin of which one is not guilty?
(5) Whether one is bound to confess at once?
(6) Whether one can be dispensed from confessing to another man?