This verse is a good example of Paul’s manner of writing. After he mentions a subject, his mind seems to catch fire. He presents it in new forms and amplifies it, until he seems to forget for a time the subject on which he was writing. This is the reason that his writings abound so with parentheses, and that there is so much difficulty in following and understanding him. The reason I say this is I’m guilty of the same thing. As my wife proofread my post on this verse, which was a couple pages long, she said I lost her. So, from now on I’ll do my best to keep it as simple as I can.
The title “Son of God” in the New Testament was given by way of eminence to the Lord Jesus Christ. This was the common and favorite title by which the apostles designated Him. The title “Son of God” is applied to Jesus no less than 27 times in the Gospels and Acts, and 15 times in the Epistles and Revelation. The other most common title which is given to Him is “Son of man.” By this title Jesus commonly designated Himself. There can be no doubt that the title “Son of man was to denote that He was a man, that He sustained a special relation to man, and that He chose to speak of Himself as a man. The first, the most obvious, impression on the use of the title “Son of man” is that he was truly a man. The title “Son of God” stands in contrast with the title “Son of man,” and as the obvious meaning is that Jesus was a man, so the obvious meaning of the title “Son of God” is that Jesus was divine and that He had a relationship to God in His nature which implied more than that He was human or angelic.