Irenaeus

In these same members, therefore, in which we used to serve sin, and bring forth fruit unto death, does He wish us to [be obedient] unto righteousness, that we may bring forth fruit unto life. Remember, therefore, my beloved friend, that thou hast been redeemed by the flesh of our Lord, re-established by His blood; and "holding the Head, from which the whole body of the Church, having been fitted together, takes increase" -that is, acknowledging the advent in the flesh of the Son of God, and [His] divinity, and looking forward with constancy to His human nature, availing thyself also of these proofs drawn from Scripture -thou dost easily overthrow, as I have pointed out, all those notions of the heretics which were concocted afterwards.