These last twelve verses of Mark are omitted from the majority of modern bibles. For an unanswered defence of the verses as we find them in the KJV, see J. W. Burgon, The Last Twelve Verse of Mark. (Available from Vital Titles.)
John 17: 15. Evil or Evil One?
In this wonderful prayer of the Saviour at the last supper, we read at this place, "I pray not that thou shouldest take them out of the world, but that thou shouldest keep them from the evil."
This is precious because as it reads in the KJV, the Lord Jesus is praying that we might be kept from the world, the flesh and the Devil. For any Christian who knows the wickedness of his flesh, a more dangerous enemy than the devil or the world; the prayer is a great protection from his flesh.
Modern bibles often change the end of the verse to " the evil one." This limits its application to the Devil only. There is no comfort against the danger of the flesh.