The truth of the matter is that Jesus could not save himself, not because of any physical constraint,
but because of a moral imperative. He came to do his Father’s will, and he would not be deflected from it. The One who cries in anguish in the garden of Gethsemane, “Not my will, but yours be done,” is under such a divine moral imperative from his heavenly Father that disobedience is finally unthinkable. It was not nails that held Jesus to that wretched cross; it was his unqualified resolution, out of love for his Father, to do his Father’s will—and, within that framework, it was his love for sinners like me. He really could not save himself. DA Carson, Scandalous, p. 30.