A refined nature is vexed by knowing that some one owes it thanks, a coarse nature by knowing that it owes thanks to some one.
Great indebtedness does not make men grateful, but vengeful.
It is safer to offend certain men than it is to oblige them; for as proof that they owe nothing they seek recourse in hatred.
When some men discharge an obligation you can hear the report for miles around.
Those who have prospered and profited from life’s lottery have a moral obligation to share their good fortune.
There are inalienable obligations as well as inalienable rights.
There are minds so impatient of inferiority that their gratitude is a species of revenge, and they return benefits, not because recompense is a pleasure, but because obligation is a pain.
Sir, I have found you an argument; but I am not obliged to find you an understanding.
Too great an eagerness to discharge an obligation is a species of ingratitude.