Albert Barnes Commentary 1 Kings 12:15

"So the king hearkened not unto the people; for it was a thing brought about of Jehovah, that he might establish his word, which Jehovah spake by Ahijah the Shilonite to Jeroboam the son of Nebat." — 1 Kings 12:15 (ASV)

The cause was from the Lord - that is, “the turn of events was from the Lord.” Human passions, such as anger, pride, and insolence, worked to bring about the fulfillment of God’s purposes. Without interfering with man’s free will, God guides the course of events and accomplishes His purposes.