Aesop tells of a peasant
Charitable, but not too wise
One winter's day was traveling
Around the land he tended.
He saw a serpent stretched out in the snow
Cold and frozen, paralyzed
Having little time to live.
The villager took him home
And, without considering the cost
Of such an action,
Laid him out before the fire
Warmed him and revived him.
The frozen serpent began to sense the warmth
Which revived his soul as well as his evil nature.
He lifted his head a bit and whistled;
Coiled his body and then struck
Against his benefactor, his saviour and his father.
"Ingrate!" said the peasant.  " 'Tis thus you repay me?
You will die!"  And with these words, in righteous rage
He took a knife and sliced the beast
Making 3 serpents with 2 cuts;
A trunk, a head, and a tail.
The evil one tried to rejoin himself
But 'twas to no avail.

Charity is a virtue but be careful toward whom
    There's no point showing it to ingrates who seal
    their own doom.

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Le Villageois et le Serpent
  
Esope conte qu'un Manant,
Charitable autant que peu sage,
Un jour d'Hiver se promenant
A l'entour de son héritage,
Aperçut un Serpent sur la neige étendu,
Transi, gelé, perclus, immobile rendu,
N'ayant pas à vivre un quart d'heure.
Le Villageois le prend, l'emporte en sa demeure,
Et sans considérer quel sera le loyer
D'une action de ce mérite,
Il l'étend le long du foyer,
Le réchauffe, le ressuscite.
L'Animal engourdi sent à peine le chaud,
Que l'âme lui revient avecque la colère.
Il lève un peu la tête, et puis siffle aussitôt,
Puis fait un long repli, puis tâche à faire un saut
Contre son bienfaiteur, son sauveur et son père.
Ingrat, dit le Manant, voilà donc mon salaire ?
Tu mourras. A ces mots, plein de juste courroux,
Il vous prend sa cognée, il vous tranche la Bête,
Il fait trois Serpents de deux coups,
Un tronçon, la queue, et la tête.
L'insecte sautillant cherche à se réunir,
Mais il ne put y parvenir.

Il est bon d'être charitable ;
Mais envers qui ? c'est là le point.
Quant aux ingrats, il n'en est point
Qui ne meure enfin misérable.