Catena Aurea on Luke 22:39–42: Dionysius the Areopagite

Or when He says, Let this cup pass from me, it is not, let it not come to Me, for unless it had come it could not pass away. It was therefore when He perceived it already present that He began to be afflicted and sorrowful, and as it was close at hand, He says, Let this cup pass; for as that which has passed can neither be said not to have come nor yet to remain, so also the Saviour asks first that the temptation slightly assailing Him may pass away. And this is the not entering into temptation which He counsels to pray for. But the most perfect way of avoiding temptation is manifested, when he says, Nevertheless, not my will, but thine be done. For God is not a tempter to evil, but lie wishes to grant us good things above what we either desire or understand. Therefore He seeks that the perfect will of His Father which He Himself had known, should dispose of the event, which is the same will as His own, as respects the Divine nature. But He shrinks to fulfil the human will, which He calls His own, and which is inferior to His Father’s will.