The message formula (II) consists of three parts. The first. "Amen," is the same Old Testament designation of God in Isa. 65:16, which appeared in the Greek form in 3:7. Like God himself, Jesus is absolutely truthful and dependable; he keeps his word. The two parts that follow refer back to 1:5 and simultaneously to the situation of the church. Jesus, "the faithful and true witness," who sealed his service with his life, finds such readiness to testify absent in Laodicea. His participation in creation is presented more sharply with the phrase "origin [or beginning] of God's creation" than in 1:4, where there was more emphasis on the majesty of Jesus Christ over history. Surely it is no accident that the tone sounded here resembles one found in Colossians (Col. 1:15-20). Apparently, Revelation also wishes to counter strongly the separation of Christ from the created world, which is represented by Gnosticism.
Jurgen Roloff. Revelation (Continental Commentary Series) (Kindle Locations 986-991). Kindle Edition.