1:5 You are my Son. The Father’s decree declaring the Messiah to be His Son is identified with Christ’s exaltation (v. 4 note; 5:5; Acts 13:32–35; Rom. 1:4). Though Jesus is the eternal and divine Son of God (Mark 1:11; John 3:16), the declaration of redemptive Sonship prophesied in Ps. 2:7 was conferred on Him in time, when He completed His messianic work. Believers cannot become divine and share in Christ’s eternal divine Sonship, but their adoption as sons of God means that they participate in Christ’s redemptive Sonship through union with the “founder of their salvation” (2:10; cf. 3:14 note; Rom. 8:29).