He was heard because of His fear. It was proper that He who took death on Himself, as answering for others, should feel its whole weight upon His soul. He would neither escape the consequences of that which He had undertaken (compare chapter 2), nor fail in the just sense of what it was thus to be under the hand of God in judgment. His fear was His piety, the right estimation of the position in which sinful man was found, and what must come from God because of it. For Him, however, to suffer the consequences of this position was obedience. And this obedience was to be perfect, and to be tried to the utmost.
J. N. Darby