Irenaus and Primary Purpose of the Atonement.
“For [God] promised, that in the last times He would pour Him [the Spirit] upon [His] servants and handmaids, that they might prophesy; wherefore He did also descend upon the Son of God, made the Son of man, becoming accustomed in fellowship with Him to dwell in the human race, to rest with human beings, and to dwell in the workmanship of God, working the will of the Father in them, and renewing them from their old habits into the newness of Christ” (Against the Heresies, III.17.1). theosis
“For it was for this end that the Word of God was made man, and He who was the Son of God became the Son of man, that man, having been taken into the Word, and receiving the adoption, might become the son of God” (Against the Heresies, III.19.1). theosis
“…the Word of God, who dwelt in man, and became the Son of man, that He might accustom man to receive God, and God to dwell in man, according to the good pleasure of the Father” (Against the Heresies, III.20.2). theosis
“…our blessed Lord Jesus Christ, who did, through His transcendent love, become what we are, that He might bring us to be even what He is Himself” (Against the Heresies, V. Preface). theosis
“But we do now receive a certain portion of His Spirit, tending towards perfection, and preparing us for incorruption, being little by little accustomed to receive and bear God…” (Against the Heresies, V.7.1). theosis