Galyn Wiemers teaches Romans 1:4-6 of Paul's introductory statements to the Romans that include the Greek word horisthentos from "horizo" that is used to refer to Jesus Christ's appointment as judge of all. The eternal Son of God was Jesus who became the Son of God in weakness (in the flesh) during his earthly ministry (phase one – suffering servant)
At the resurrection Jesus entered into phase two of the Messiah’s ministry. He received his appointment as judge of all men and ruler of God’s kingdom. Jesus became the Son of God in power (again, in the flesh).

Notes are here - http://generationword.com/notes/romans/03-Romans_1_1-7.pdf