Charles Spurgeon Commentary 2 Chronicles 33:14-17

"Now after this he built an outer wall to the city of David, on the west side of Gihon, in the valley, even to the entrance at the fish gate; and he compassed Ophel about [with it], and raised it up to a very great height: and he put valiant captains in all the fortified cities of Judah. And he took away the foreign gods, and the idol out of the house of Jehovah, and all the altars that he had built in the mount of the house of Jehovah, and in Jerusalem, and cast them out of the city. And he built up the altar of Jehovah, and offered thereon sacrifices of peace-offerings and of thanksgiving, and commanded Judah to serve Jehovah, the God of Israel. Nevertheless the people sacrificed still in the high places, but only unto Jehovah their God." — 2 Chronicles 33:14-17 (ASV)

Now after this he built a wall without the city of David, on the west side of Gihon, in the valley, even to the entering in at the fish gate, and compassed about Ophel, and raised it up a very great height, and put captains of war in all the fenced cities of Judah. And he took away the strange gods, and the idol out of the house of the LORD, and all the altars that he had built in the mount of the house of the LORD, and in Jerusalem, and cast them out of the city. And he repaired the altar of the Lord, and sacrificed thereon peace offerings and thank offerings, and commanded Judah to serve the LORD God of Israel. Nevertheless the people did sacrifice still in the high places,

They do the same today, and we cannot get them away from them. Even some who love the gospel yet cling to the old Romish rites and ceremonies. Ah, men do love to multiply outward performances instead of spiritual worship! The one altar of Calvary is not enough for them; they must have many altars: Nevertheless the people did sacrifice still in the high places.