Library Ignatius of Antioch Epistles (Middle Recension)
Magnesians, Chapter 12: You are superior to me
May I enjoy you in all respects, if indeed I be worthy! For though I am bound, I am not worthy to be compared to any of you that are at liberty. I know that you are not puffed up, for you have Jesus Christ in yourselves. And all the more when I commend you, I know that you cherish modesty of spirit; as it is written, The righteous man is his own accuser.
Proverbs 18:17
English translation in Ante-Nicene Fathers, Vol. I (eds. Alexander Roberts and James Donaldson; Buffalo: Christian Literature Publishing Co., 1885). Public domain. Digital text via New Advent Church Fathers. ANF prints the shorter Greek (middle) recension.