Whether in giving thanks we should look at the benefactor's disposition or at the deed?
Objection 1: It seems that in repaying favors we should not look at the benefactor's disposition but at the deed. For repayment is due to beneficence, and beneficence consists in deeds, as the word itself denotes. Therefore in repaying favors we should look at the deed.
Objection 2: Further, thanksgiving, whereby we repay favors, is a part of justice. But justice considers equality between giving and taking. Therefore also in repaying favors we should consider the deed rather than the disposition of the benefactor.
Objection 3: Further, no one can consider what he does not know. Now God alone knows the interior disposition. Therefore it is impossible to repay a favor according to the benefactor's disposition.
On the contrary, Seneca says (De Benef. i): "We are sometimes under a greater obligation to one who has given little with a large heart, and has bestowed a small favor, yet willingly."
I answer that, The repayment of a favor may belong to three virtues, namely, justice, gratitude and friendship. It belongs to justice when the repayment has the character of a legal debt, as in a loan and the like: and in such cases repayment must be made according to the quantity received.
On the other hand, repayment of a favor belongs, though in different ways, to friendship and likewise to the virtue of gratitude when it has the character of a moral debt. For in the repayment of friendship we have to consider the cause of friendship; so that in the friendship that is based on the useful, repayment should be made according to the usefulness accruing from the favor conferred, and in the friendship based on virtue repayment should be made with regard for the choice or disposition of the giver, since this is the chief requisite of virtue, as stated in Ethic. viii, 13. And likewise, since gratitude regards the favor inasmuch as it is bestowed gratis, and this regards the disposition of the giver, it follows again that repayment of a favor depends more on the disposition of the giver than on the effect.
Reply to Objection 1: Every moral act depends on the will. Hence a kindly action, in so far as it is praiseworthy and is deserving of gratitude, consists materially in the thing done, but formally and chiefly in the will. Hence Seneca says (De Benef. i): "A kindly action consists not in deed or gift, but in the disposition of the giver or doer."
Reply to Objection 2: Gratitude is a part of justice, not indeed as a species is part of a genus, but by a kind of reduction to the genus of justice, as stated above (Q[80]). Hence it does not follow that we shall find the same kind of debt in both virtues.
Reply to Objection 3: God alone sees man's disposition in itself: but in so far as it is shown by certain signs, man also can know it. It is thus that a benefactor's disposition is known by the way in which he does the kindly action, for instance through his doing it joyfully and readily.
Whether the repayment of gratitude should surpass the favor received?
Objection 1: It seems that there is no need for the repayment of gratitude to surpass the favor received. For it is not possible to make even equal repayment to some, for instance, one's parents, as the Philosopher states (Ethic. viii, 14). Now virtue does not attempt the impossible. Therefore gratitude for a favor does not tend to something yet greater.
Objection 2: Further, if one person repays another more than he has received by his favor, by that very fact he gives him something his turn, as it were. But the latter owes him repayment for the favor which in his turn the former has conferred on him. Therefore he that first conferred a favor will be bound to a yet greater repayment, and so on indefinitely. Now virtue does not strive at the indefinite, since "the indefinite removes the nature of good" (Metaph. ii, text. 8). Therefore repayment of gratitude should not surpass the favor received.
Objection 3: Further, justice consists in equality. But "more" is excess of equality. Since therefore excess is sinful in every virtue, it seems that to repay more than the favor received is sinful and opposed to justice.
On the contrary, The Philosopher says (Ethic. v, 5): "We should repay those who are gracious to us, by being gracious to them return," and this is done by repaying more than we have received. Therefore gratitude should incline to do something greater.
I answer that, As stated above (A[5]), gratitude regards the favor received according the intention of the benefactor; who seems be deserving of praise, chiefly for having conferred the favor gratis without being bound to do so. Wherefore the beneficiary is under a moral obligation to bestow something gratis in return. Now he does not seem to bestow something gratis, unless he exceeds the quantity of the favor received: because so long as he repays less or an equivalent, he would seem to do nothing gratis, but only to return what he has received. Therefore gratitude always inclines, as far as possible, to pay back something more.
Reply to Objection 1: As stated above (A[3], ad 5; A[5]), in repaying favors we must consider the disposition rather than the deed. Accordingly, if we consider the effect of beneficence, which a son receives from his parents namely, to be and to live, the son cannot make an equal repayment, as the Philosopher states (Ethic. viii, 14). But if we consider the will of the giver and of the repayer, then it is possible for the son to pay back something greater to his father, as Seneca declares (De Benef. iii). If, however, he were unable to do so, the will to pay back would be sufficient for gratitude.
Reply to Objection 2: The debt of gratitude flows from charity, which the more it is paid the more it is due, according to Rom. 13:8, "Owe no man anything, but to love one another." Wherefore it is not unreasonable if the obligation of gratitude has no limit.
Reply to Objection 3: As in injustice, which is a cardinal virtue, we consider equality of things, so in gratitude we consider equality of wills. For while on the one hand the benefactor of his own free-will gave something he was not bound to give, so on the other hand the beneficiary repays something over and above what he has received.