John Gill Commentary Isaiah 10:7

"Howbeit he meaneth not so, neither doth his heart think so; but it is in his heart to destroy, and to cut off nations not a few." — Isaiah 10:7 (ASV)

Howbeit he means not so, neither does his heart think so,
&c.] His purposes, intentions, and thoughts, were not as the Lord's; he did not imagine that he was only the rod of his anger, and the staff of his indignation, a minister of his wrath, and the executioner of his vengeance; he thought he was his own lord and master, and acted by his own power, and according to his own will, and was not under the direction and restraints of another; his intention was not to chastise and correct the people of the Jews, but utterly to destroy them, and not them only, but many other nations; as follows: but [it is] in his heart to destroy and cut off nations, not a few; not the nation of the Jews only, but many others, and so establish an universal monarchy; and what flushed him with hope and expectation of success were the magnificence of his princes, and the conquests he had already made.