Albert Barnes Commentary 2 Kings 19:25

"Hast thou not heard how I have done it long ago, and formed it of ancient times? now have I brought it to pass, that it should be thine to lay waste fortified cities into ruinous heaps." — 2 Kings 19:25 (ASV)

Have you not heard long ago ... - Rather, Have you not heard that from long ago I did this, from ancient times I fashioned it? etc. The first part of the verse refers to the secret divine decrees, by which the affairs of this world are determined and ordered from the very beginning of things. Sennacherib’s boasting, however, proved that he did not know this. He did not recognize himself simply as God’s instrument, the rod of His anger (Isaiah 10:5), but regarded his victories as gained by his own strength and wisdom (Isaiah 10:13).