Whether in giving thanks we should look at the benefactor's disposition or at the deed?

Objections

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.