St Theodoros the Great Ascetic | He who keeps a serpent in his breast...

He who keeps a serpent in his breast and he who keeps an evil thought in his heart will both be killed, the one by being bitten in the body by venomous fangs and the other by injecting a lethal poison into his soul. Let us, then, speedily slay the "offspring of vipers" ( Matt 3:7), and let us not bring forth evil thoughts from our heart, let we suffer bitter pangs.

St Theodoros the Great Ascetic