John Gill Commentary 2 Chronicles 29:36

"And Hezekiah rejoiced, and all the people, because of that which God had prepared for the people: for the thing was done suddenly." — 2 Chronicles 29:36 (ASV)

And Hezekiah rejoiced, and all the people
To see things go on so well, which foreboded good to them: and particularly that God had prepared the people ; disposed and directed their hearts in such a manner as to yield such a cheerful obedience to the will of God, and show such a hearty regard to his worship and service, and the restoration of it:

for the thing was done suddenly ; whereby it the more appeared that they were under a divine influence, which so quickly and powerfully wrought upon them to engage in this work. They needed not arguments and persuasions to bring them to it.