The high places were not taken away - Without the total destruction of these there could be no radical reform. The toleration of any species of idolatry in the land, whatever else was done in behalf of true religion, left, and in effect fostered, a seed which springing up, regenerated in time the whole infernal system. Jehoiada did not use his influence as he might have done; for as he had the king's heart and hand with him, he might have done what he pleased.
The worship on the “high places” seems to have continued uninterruptedly to the time of Hezekiah, who abolished it 2 Kings 18:4. It was, however, again established by Manasseh, his son 2 Kings 21:3. The priests at this time cannot have regarded it as idolatrous, or Jehoiada would have put it during his regency.