Isaiah 29:14

Israel being thus hopelessly estranged from true knowledge of Jehovah, Jehovah must (and will) reveal His character in a way not to be misunderstood.

behold, I will proceed The Hebr. has the same peculiar construction as in Isaiah 28:16.

to do a marvellous … wonder Render: to work wonderfully with this people, wonderfully and wondrously (cf. Isaiah 28:21).

the wisdom of their wisemen (cf. Jeremiah 18:18) shall perish so far will the issue surpass human forethought.

shall be hid shall hide itself, in shame and confusion.