The Word of God reveals this regarding “kings ordained by God”:

“As the heavens for height and the earth for depth, So the heart of kings is unsearchable.” (Proverbs 25:3)

Who are these “kings” whom verse 3 (above) refers to?

The verse prior (verse 2) reveals “them” as follows:

These kings are the ones who will “figure out some matter” which has been “hidden” (concealed, kept secret) by God as the verse prior mentions it (i.e. intrinsically implied that God Will “reveal it” to “them”):

“It is the glory of God to conceal a matter, But the glory of kings is to search out a matter.” (Proverbs 25:2)

It’s apparent that these “hidden secrets” must be “about God” and not regarding worldly matters.

“for the gifts and the calling of God are irrevocable.” (Romans 11:29)