Adam Clarke on 2 Kings 12:6

In the three and twentieth year - In what year Jehoash gave the orders for these repairs, we cannot tell; but the account here plainly intimates that they had been long given, and that nothing was done, merely through the inactivity and negligence of the priests; see 2Chr 24:6.

It seems that the people had brought money in abundance, and the pious Jehoiada was over the priests, and yet nothing was done! Though Jehoiada was a good man, he does not appear to have had much of the spirit of an active zeal; and simple piety, without zeal and activity, is of little use when a reformation in religion and manners is necessary to be brought about. Philip Melancthon was orthodox, pious, and learned, but he was a man of comparative inactivity. In many respects Martin Luther was by far his inferior, but in zeal and activity he was a flaming and consuming fire; and by him, under God, was the mighty Reformation, from the corruptions of popery, effected. Ten thousand Jehoiadas and Melancthons might have wished it in vain; Luther worked, and God worked by him, in him, and for him.