Human nature is so constituted that insults sink deeper than kindnesses; the remembrance of the latter soon passes away, while that of the former is treasured in the memory.
Seneca the YoungerIt 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 Younger