The Son of God with power
...the momentously transforming significance of the exaltation for Christ personally. In his resurrection something really happened to Jesus. As Paul puts it elsewhere (Rom. 1:4), by the declarative energy of the Holy Spirit in his resurrection, God's eternal (Rom. 1:3a) and now incarnate (Rom 1:36) Son has become what he was not previously, "the Son of God with power." He now has a glorified human nature (2 Cor. 13:4)
Richard Gaffin, Resurrection and Redemption: How Eschatology and The Gospel Relate, Modern Reformation (Philadelphia, PA: Alliance of Confessing Evangelicals, 1999), 24