Charles Ellicott Commentary Galatians 6:18

"The grace of our Lord Jesus Christ be with your spirit, brethren. Amen." — Galatians 6:18 (ASV)

With your spirit.—The grace of God works especially on the “spirit,” or highest part, of man.

[The subscription, as it stands in our Bibles, appears for the first time in manuscripts dating from about the beginning of the ninth century, though before this the Epistle had been described as written from Rome by Theodoret, Euthalius, and Jerome. We have seen that the choice really lies between Ephesus and Macedonia, or Corinth, and that the probability seems to be somewhat in favour of the latter.]