The grace of the Lord Jesus Christ, and the love of God, and the fellowship of the Holy Spirit, be with you all. Amen.
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Ambrose of Milan
AD 397
If there is one grace, one peace, one love and one fellowship on the part of the Father and of the Son and of the Holy Spirit, surely there is one operation, and where there is one operation, certainly the power cannot be divided or the substance separated. .
Here is the intertwining of the Trinity and the unity of power which brings all salvation to fulfillment. The love of God has sent us Jesus the Savior, by whose grace we have been saved. The fellowship of the Holy Spirit makes it possible for us to possess the grace of salvation, for he guards those who are loved by God and saved by the grace of Christ, so that the completeness of the Three may be the saving fulfillment of mankind. Commentary on Paul’s Epistles.
3. The grace of our Lord Jesus Christ, and the love of God, and the Father, and the communion of the Holy Ghost, be with you all. After having united them to one other by the salutations and the kisses, he again closes his speech with prayer, with much carefulness uniting them unto God also. Where now are they who say that because the Holy Spirit is not inserted in the beginnings of the Epistles, He is not of the same substance? For, behold, he has now enumerated Him with the Father and Son. And besides this, one may remark, that when writing to the Colossians and saying, Grace to you, and peace from God our Father, he was silent of the Son, and added not, as in all his Epistles, and from the Lord Jesus Christ. Is then the Son not of the same substance either, because of this? Nay, these reasonings are of extreme folly. For this very thing especially shows Him to be of the same substance, that Paul uses the expression [or not] indifferently. And that what is here said is no conjecture,...