Through 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.
with the help of -- [NLT] This phrase identifies Silas as the amanuensis, the person who wrote the words as Peter directed. • Silas (Greek Silvanus): Silas is the shortened form of Silvanus; both names refer to the same individual. Silas was Paul’s constant colleague after the time of the council in Jerusalem (Acts 15:40; Acts 16:19; Acts 17:10, Acts 17:14-15; Acts 18:5; 2 Corinthians 1:19; 1 Thessalonians 1:1; 2 Thessalonians 1:1). We are not sure how Silas ended up with Peter in Rome, but he may have traveled with or followed Paul (Acts 27–28). - NLTSB