full of all subtlety - referring to his magic arts.
and all malice - The word signifies “readiness for anything,” knavish dexterity.
thou child of the devil ... enemy of all righteousness - These were not words of passion, for immediately before uttering them, it is said he was “filled with the Holy Ghost” [Chrysostom].
wilt thou not cease to pervert the right ways of the Lord - referring to his having to that hour made a trade of leading his fellow creatures astray.