Peter, then, in saying thus, suggested that another must be chosen in place of Judas, to fill up the deficient number of the twelve apostles, so that the prophecy might be fulfilled. And when the lot had been cast, it fell upon Matthias, and he was numbered with the twelve apostles. Since this was (b) thus fulfilled, it follows that the person who speaks in this Psalm can only be our Saviour, Who thought good to anticipate by the record of the Holy Spirit the very prayer that was sent up by Him to the Father at the time of His Passion, foretelling what would happen to Him in the future.