This verse is omitted in many good manuscripts and by the Revised Version, it being considered to have been introduced from the parallel passage of St. Mark. It gives the second reason for the failure of the nine. This kind … fasting. Though all things are possible to faith, some works are more difficult of accomplishment than others. This kind can mean only this kind of evil spirit, or demons generally. But the latter interpretation is excluded by the fact that the apostles had already exercised successfully their power over devils without special prayer or fasting. The words point to a truth in the spiritual world, that there are different degrees in the Satanic hierarchy (comp. Matthew 12:45); some demons are more malignant than others, and have greater power over the souls of men. In the present case the possession was of long standing; it revolved a terrible bodily malady; it was of an intense and unusual character. The mere word of exorcism, or the name of Jesus, spoken with little spiritual faith, could net overcome the mighty enemy. The exorcist needed special preparation; he must inspire and augment his faith by prayer and self-discipline. Prayer invokes the aid of God, and puts one's self unreservedly in his hands; fasting subdues the flesh, arouses the soul's energies, brings into exercise the higher parts of man's nature. Thus equipped, a man is open to receive power from on high, and can quell the assaults of the evil one.
Second official announcement of the Passion and Resurrection. (Mark 9:30-32; Luke 9:43-45.)