Nicene and Post-Nicene Fathers: Series I/Volume V/On Nature and Grace/Chapter 37

Chapter 37 [XXXIII.]—Being Wholly Without Sin Does Not Put Man on an Equality with God.

But God forbid that we should meet him with such an assertion as he says certain persons advance against him: “That man is placed on an equality with God, if he is described as being without sin;” as if indeed an angel, because he is without sin, is put in such an equality. For my own part, I am of this opinion that the creature will never become equal with God, even when so perfect a holiness shall be accomplished in us, that it shall be quite incapable of receiving any addition. No; all who maintain that our progress is to be so complete that we shall be changed into the substance of God, and that we shall thus become what He is, should look well to it how they build up their opinion; for myself I must confess that I am not persuaded of this.