Gesta Romanorum Vol. II (1871)/Of the poisonous nature of Sin
OF THE POISONOUS NATURE OF SIN.
The enemies of a certain king wished to destroy him by administering a very potent poison. Some of them came to the city where he abode, arrayed in humble garments. Now there was a fountain of water, from which the king frequently drank, and they impregnated it with the poison. The king, ignorant of their treason, drank according to custom, and died.
The king is Adam; his enemies are the devils; and the fountain is the human heart.