It is a common thing to screw up justice to the pitch of an injury. A man may be over-righteous, and why not over-grateful, too? There is a mischievous excess that borders so close upon ingratitude that it is no easy matter to distinguish the one from the other; but, in regard that there is good-will in the bottom of it, however distempered; for it is effectually but kindness out of the wits.
Seneca the YoungerSome pretend want of power to make a competent return; and you shall find in others a kind of graceless modesty, that makes a man ashamed of requiting an obligation, because it is a confession that he has received one.
Seneca the Younger