The Hen and the Swallow

by Aesop

A HEN finding the eggs of a viper, and carefully keeping them warm, nourished them into life. A Swallow, observing what she had done, said: You silly creature! Why have you hatched these vipers, which, when they shall have grown, will surely inflict injury on all of us, beginning with yourself?

Moral:
If we nourish evil, it will sooner or later turn upon us.