/summa/XP/XPII/XP_Q12:
We must now consider satisfaction; about which four things have to be considered: (1) Its nature; (2) Its possibility; (3) Its quality; (4) The means whereby man offers satisfaction to God.
Under the first head there are three points of inquiry:
(1) Whether satisfaction is a virtue or an act of virtue?
(2) Whether it is an act of justice?
(3) Whether the definition of satisfaction contained in the text is suitable?