Augustine of Hippo

"He was a murderer from the beginning." This it is that explains, "the lusts of your father ye will do." "Ye seek to kill me, a man that telleth you the truth." He, too, had ill-will to man, and slew man. For the devil, in his ill-will to man, assuming the guise of a serpent, spoke to the woman, and from the woman instilled his poison into the man. They died by listening to the devil, whom they would not have listened to had they but listened to the Lord; for man, having his place between Him who created and him who was fallen, ought to have obeyed the Creator, not the deceiver. Therefore "he was a murderer from the beginning." Look at the kind of murder brethren. The devil is called a murderer, not as armed with a sword, or girded with steel. He came to man, sowed his evil suggestions, and slew him. Think not, then, that thou art not a murderer when thou persuadest thy brother to evil. If thou persuadest thy brother to evil, thou slayest him. And to let thee know that thou slayest him, listen to the psalm: "The sons of men, whose teeth are spears and arrows, and their tongue a sharp sword."