Proverbs 25:3 KJV
The heaven for height, and the earth for depth, and the heart of kings is unsearchable.
Proverbs 25:3, King James Version
In context
2 It is the glory of God to conceal a thing: but the honour of kings is to search out a matter.
3 The heaven for height, and the earth for depth, and the heart of kings is unsearchable.
4 Take away the dross from the silver, and there shall come forth a vessel for the finer.