they shall proceed no further - Though for a time (2Ti 2:16) “they shall advance or proceed (English Version, ‘increase’) unto more ungodliness,” yet there is a final limit beyond which they shall not be able to “proceed further” (Job 38:11; Rev 11:7, Rev 11:11). They themselves shall “wax worse and worse” (2Ti 3:13), but they shall at last be for ever prevented from seducing others. “Often malice proceeds deeper down, when it cannot extend itself” [Bengel].
their folly - literally, “dementation”: wise though they think themselves.
shall be manifest - Greek, “shall be brought forth from concealment into open day” [Bengel], (1Co 4:5).
as theirs ... was - as that of those magicians was, when not only could they no longer try to rival Moses in sending boils, but the boils fell upon themselves: so as to the lice (Exo 8:18; Exo 9:11).