He who has conferred a benefit on anyone from motives of love or honor will feel pain, if he sees that the benefit is received without gratitude.
AristotleMen agree that justice in the abstract is proportion, but they differ in that some think that if they are equal in any respect they are equal absolutely, others that if they are unequal in any respect they should be unequal in all. The only stable principle of government is equality according to proportion, and for every man to enjoy his own.
Aristotle