Hell is full of the ungrateful. [ Proverb ]

The wicked are always ungrateful. [ Cervantes ]

To be ungrateful is to be unnatural.
The head may be thus guilty, not the heart. [ Rivarol ]

The string that jars
When rudely touch'd, ungrateful to the sense,
With pleasure feels the master's flying fingers,
Swells into harmony and charms the hearers. [ Rowe ]

Great minds, like Heaven, are pleased in doing good,
Though the ungrateful subjects of their favours
Are barren in return. [ Rowe ]

Men may be ungrateful, but the human race is not so. [ De Boufflers ]

One is very near being ungrateful when one weighs a service. [ Mme. de Flahaut ]

He's not ungrateful that cannot, but he that will not repay. [ Proverb ]

One ungrateful man does an injury to all who are in suffering. [ Syrus ]

To do good to the ungrateful, is to throw rose-water into the sea. [ Proverb ]

He that calls a man ungrateful sums up all the evil that a man can be guilty of. [ Swift ]

Every time I appoint to a vacant post, I make a hundred discontented and one ungrateful. [ Louis XIV ]

He that is ungrateful has no guilt but one; all other crimes may pass for virtues in him. [ Young ]

A kindness is always delightful to a grateful man; to an ungrateful, only at the time of its receipt. [ Seneca ]

Flints may be melted - we see it daily - but an ungrateful heart cannot; no, not by the strongest and the noblest flame. [ South ]

To despond is to be ungrateful beforehand. Be not looking for evil. Often thou drainest the gall of fear while evil is passing thy dwelling. [ Tupper ]

He is ungrateful who denies a benefit; he is ungrateful who hides it; he is ungrateful who does not return it; he, most of all, who has forgotten it. [ Seneca ]

The man abandoned by his friends, one after another, without just cause, will acquire the reputation of being hard to please, changeable, ungrateful, unsociable. [ Joseph Roux ]

Man is, beyond dispute, the most excellent of created beings, and the vilest animal is a dog; but the sages agree that a grateful dog is better than an ungrateful man. [ Saadi ]

Was genius ever ungrateful? Mere talents are dry leaves, tossed up and down by gusts of passion, and scattered and swept away; but Genius lies on the bosom of Memory, and Gratitude at her feet. [ Landor ]

Friendship is like a debt of honor; the moment it is talked of it loses its real name, and assumes the more ungrateful form of obligation. From hence we find that those who regularly undertake to cultivate friendship find ingratitude generally repays their endeavors. [ Goldsmith ]