ST Suppl., q. 42
Of Matrimony as a Sacrament
Supplement — compiled posthumously from Aquinas's early Sentences commentary
We must next consider matrimony as a sacrament. Under this head there are four points of inquiry:
(1) Whether matrimony is a sacrament?
(2) Whether it ought to have been instituted before sin was committed?
(3) Whether it confers grace?
(4) Whether carnal intercourse belongs to the integrity of matrimony?