2.
You love a nothing when you love an ingrate.
Plautus
4.
We must hide our tears from the One who sends them, from the One who has shed tears Himself and continues to shed them every day because of mans' ingratitude.
Pio of Pietrelcina
6.
We set ourselves to bite the hand that feeds us.
Edmund Burke
7.
The greatest kindness will not bind the ungrateful.
Aesop
8.
Radically and basically, all sin is simply ingratitude.
Karl Barth
10.
Serve many fruitlessly, If one repay, Th' ingratitude of thousands 'twill outweigh.
Luigi Pulci
13.
Ingratitude is often disproportionate to the benefaction received.
Karl Kraus
14.
It is better to expose ourselves to ingratitude than to neglect our duty to the distressed.
Jean de la Bruyere