For whom he did foreknow, he also did predestinate to be conformed to the image of his Son, that he might be the firstborn among many brethren.
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Severian of Gabala
AD 425
Paul says “the image of the Son” meaning the Holy Spirit, because just as the Son is the immutable image of the Father, so the Spirit is of the Son. For those who have been made worthy by the Holy Spirit live according to the Spirit and are conformed to the Spirit, who is the image of the Son. .