6 “When Jesus therefore had received the vinegar, He said, It is finished.” What, but all that prophecy had foretold so long before? And then, because nothing now remained that still required to be done before He died, as if He, who had power to lay down His life and to take it up again, had at length completed all for whose completion He was waiting, “He bowed His head, and gave up the ghost.” Who can thus sleep when he pleases, as Jesus died when He pleased? Who is there that thus puts off his garment when he pleases, as He put off His flesh at His pleasure? Who is there that thus departs when he pleases, as He departed this life at His pleasure? How great the power, to be hoped for or dreaded, that must be His as judge, if such was the power He exhibited as a dying man!
Source: Tractates on the Gospel of John (New Advent)