João 17
Jerome · Comentário Patrístico (catena)
João 17:20
He reminds us that the whole Christian people are one in God, and, as his well-beloved children, are "partakers of the divine nature." We have already said (and the truth must now be inculcated more in detail) that we are not one in the Father and the Son according to nature but according to grace. For the essence of the human soul and the essence of God are not the same, as the Manichaeans constantly assert. But, says our Lord, "You have loved them as you have loved me." You see, then, that we are privileged to partake of his essence, not in the realm of nature but of grace. And the reason why we are beloved of the Father is that he has loved the Son—and the members of the body are loved. — Against Jovinianus 2.29
João 17:21
"As we are Father, Son and Holy Spirit, one God," [Jesus might say], "so may they be one people in themselves, that is, like dear children and partakers of the divine nature." Call the church what you will—bride, sister, mother—its assembly is but one and never lacks husband, brother or son. [The church's] faith is one, and it is not defiled by variety of doctrine or divided by heresies. [The church] continues a virgin. Wherever the Lamb goes, it follows him. It alone knows the song of Christ. — Against Jovinianus 2.19