Albert Barnes Commentary Proverbs 25:2

"It is the glory of God to conceal a thing; But the glory of kings is to search out a matter." — Proverbs 25:2 (ASV)

The earthly monarch might be, in some respects, the type of the heavenly, but here there is a marked contrast. The king presses further and further into all knowledge; God surrounds Himself as in “thick darkness,” and there are secrets unrevealed even after the fullest revelation.