Albert Barnes Commentary Isaiah 29:14

"therefore, behold, I will proceed to do a marvellous work among this people, even a marvellous work and a wonder; and the wisdom of their wise men shall perish, and the understanding of their prudent men shall be hid." — Isaiah 29:14 (ASV)

I will proceed to do - Hebrew, ‘I will add to do;’ that is, I will do it.

For the wisdom of their wise men shall perish - I will bring calamity upon them which shall baffle all the skill and wisdom of their wise men.

Shall be hid - That is, shall not appear; shall vanish. It shall not be sufficient to prevent the calamities that shall come upon the nation.