<p>10:7 <em>Then said I: Behold, I come (in the roll of the book it is written about me) to do Your will, O God</em>- The will of God is specifically associated with the Lord's death on the cross (e.g. Mt. 26:39). The entire scroll of the Pentateuch the &quot;roll of the book&quot; known to David at the time of Psalm 40 implied the death of a perfect human sacrifice who would complete God's will for human salvation in totality. And Paul is applying these thoughts of David to the Lord Jesus as He began His ministry or perhaps specifically when He died, or when He began His priestly service on entering Heaven; see on :5.</p>