Great indebtedness does not make men grateful, but vengeful; and if a little charity is not forgotten, it turns into a gnawing worm.
Learning from one's enemies is the best way to love them, for it puts one into a grateful mood toward them.
A reader is doubly guilty of bad manners against an author when he praises his second book at the expense of his first (or vice versa) and then expects the author to be grateful for what he has done.
If one considers how much reason every person has for anxiety and timid self-concealment, and how three-quarters of his energy and goodwill can be paralyzed and made unfruitful by it, one has to be very grateful to fashion
When the gratitude of many to one throws away all shame, we behold fame.
To learn from our enemies is the best pathway to loving them: for it makes us grateful to them.