And Hezekiah did according to this throughout all Judah. And he did what is good and what is right and what is faithful before Yahweh his God. – 2 Chronicles 31.20, LEB
A good summary of the reforms under Hezekiah. He did not carry them out in order to make himself look better, or because he wanted to be dictator of the people, or just because he could because, hey, he was the king of everything. He carried out his reforms because he loved God and wanted to do what pleased him.
I was listening to a sermon by Martyn Lloyd-Jones yesterday in which he said essentially the same thing. He was preaching on Rom 8.15-16, where Paul says that we have not been given a spirit of fear leading to slavery, but a spirit of adoption by which we cry out, Abba, Father. When we come to faith we do not have to follow God’s law out of fear that he will crush us if we do not. We are his adopted children, we follow him (as Hezekiah did) because he is our father and we love him.
We do what is good and what is right and what is faithful because we belong to God and want to please our Abba, our Papa. This is not out of obligation, but out of devotion.