Whether certain blessings are necessary in order to excuse marriage?

Objections

Objection 1 : It would seem that certain blessings are not necessary in order to excuse marriage. For just as the preservation of the individual which is effected by the nutritive power is intended by nature, so too is the preservation of the species which is effected by marriage; and indeed so much the more as the good of the species is better and more exalted than the good of the individual. But no goods are necessary to excuse the act of the nutritive power. Neither therefore are they necessary to excuse marriage.
Objection 2 : Further, according to the Philosopher (Ethic. viii, 12) the friendship between husband and wife is natural, and includes the virtuous, the useful, and the pleasant. But that which is virtuous in itself needs no excuse. Therefore neither should any goods be assigned for the excuse of matrimony.
Objection 3 : Further, matrimony was instituted as a remedy and as an office, as stated above (Question [42], Article [2]). Now it needs no excuse in so far as it is instituted as an office, since then it would also have needed an excuse in paradise, which is false, for there, as Augustine says, "marriage would have been without reproach and the marriage-bed without stain" (Gen. ad lit. ix). In like manner neither does it need an excuse in so far as it is intended as a remedy, any more than the other sacraments which were instituted as remedies for sin. Therefore matrimony does not need these excuses.
Objection 4 : Further, the virtues are directed to whatever can be done aright. If then marriage can be righted by certain goods, it needs nothing else to right it besides the virtues of the soul; and consequently there is no need to assign to matrimony any goods whereby it is righted, any more than to other things in which the virtues direct us.