New Revised Standard Version
Like the heavens for height, like the earth for depth, so the mind of kings is unsearchable.

Contemporary English Version
Who can fully understand the thoughts of a ruler? They reach beyond the sky and go deep in the earth.

New American Bible
Like the heavens in height, and the earth in depth, the heart of kings is unfathomable.

Douay-Rheims Bible
The heaven above and the earth beneath, and the heart of kings is unsearchable.

The heaven above and the earth beneath, and the heart of kings is unsearchable.

heaven

Psalm 103:11 For according to the height of the heaven above the earth: he hath strengthened his mercy towards them that fear him.

Isaiah 7:11 Ask thee a sign of the Lord thy God, either unto the depth of hell, or unto the height above.

Isaiah 55:9 For as the heavens are exalted above the earth, so are my ways exalted above your ways, and my thoughts above your thoughts.

Romans 8:39 Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God which is in Christ Jesus our Lord.

is unsearchable

1 Kings 4:29 And God gave to Solomon wisdom, and understanding exceeding much, and largeness of heart, as the sand that is on the sea shore.

1 Peter 1:7 That the trial of your faith (much more precious than gold which is tried by the fire) may be found unto praise and glory and honour at the appearing of Jesus Christ.