With all his heart: His obedience wanted three necessary properties, care or heedfulness, universality, and sincerity. He departed not from the sins of Jeroboam; his resolved continuance in one single course is justly alleged as an argument of his false-heartedness in all his other actions.
Related Commentaries of 2 Kings 10:31
2 Kings 10:31
31 But Jehu took no heed to walk in the law of the LORD God of Israel with all his heart: for he departed not from the sins of Jeroboam, which made Israel to sin.