(Taken from David Guzik Commentary on the Bible, Studylight.org)
(1 Peter 5:12-14) .
By Silvanus, our faithful brother as I consider him, I have written to you briefly, exhorting and testifying that this is the true grace of God in which you stand. She who is in Babylon, elect together with you, greets you; and so does Mark my son. Greet one another with a kiss of love. Peace to you all who are in Christ Jesus. Amen.
By Silvanus . . . I have written to you: This portion was probably written by Peter’s own hand, after he (according to the custom of the day) had dictated the bulk of the letter to Silvanus. This man Silvanus is probably the same one known as Silas in many of Paul’s letters.
This is the true grace of God in which you stand: Peter sums up his message as an exhortation to understand and recognize the true grace of God in which you stand. We must understand not only what God’s grace is, but that grace is our place of present standing before Him.
She who is in Babylon . . . greets you: She probably refers to the church, which in Greek is in the feminine. Peter apparently writes from Babylon. This may be the literal city of Babylon (which still existed in Peter’s day), or it may be a symbolic way of referring to either Rome or Jerusalem. These were two cities that in Peter’s day were famous for their wickedness and spiritual rebellion, just like ancient Babylon. In any regard, this is one church greeting another.
So does Mark my son: This verse connects Mark with Peter, apparently the same Mark of Acts 12:12; Acts 12:25; Acts 15:37-39. When the style and perspective of the Gospel of Mark are taken into account, many to believe that Peter was Mark’s primary source of information for his gospel.
Greet one another with a kiss of love: Peter concludes with a command to greet and display God’s love to one another, and by pronouncing a blessing of peace. These two things - love for each other and peace - are especially necessary for those who suffer and live in dangerous times.