Assuredly, Loving Souls, you should go to God with all humility and respect, humbling yourselves in His presence, especially when you remember your past ingratitude and sins.
Alphonsus Liguori

Ingratitude is the essence of vileness.
Immanuel Kant

Ingratitude is treason to mankind.
James Thomson

Most people return small favors, acknowledge medium ones and repay greater ones - with ingratitude.
Benjamin Franklin

Next to ingratitude the most painful thing to bear is gratitude.
Henry Ward Beecher

Too great haste to repay an obligation is a kind of ingratitude.
Francois de La Rochefoucauld

We often fancy that we suffer from ingratitude, while in reality we suffer from self-love.
Walter Savage Landor

We think that we suffer from ingratitude, while in reality we suffer from self-love.
Walter Savage Landor