Proverbs 25:3

The heavens for height, and the earth for depth, but the heart of kings is without searching.

1 Kings 4:29

And God gave Solomon exceeding great wisdom and understanding, and largeness of heart, even as the sand that is on the seashore.

Psalm 103:11

For as the heavens are high above the earth, so is His mercy toward those who fear Him.

Isaiah 7:11

Ask a sign of Jehovah your God; ask it either in the depth, or in the height above.

Isaiah 55:9

For as the heavens are higher than the earth, so are My ways higher than your ways, and My thoughts than 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.

1 Peter 1:7

so that the trial of your faith (being much more precious than that of gold that perishes, but being proven through fire) might be found to praise and honor and glory at the revelation of Jesus Christ,

Treasury of Scripture Knowledge

Summary

The heaven for height, and the earth for depth, and the heart of kings is unsearchable.

Is unsearchable

General references

Bible References

Heaven

Psalm 103:11
For as the heavens are high above the earth, so is His mercy toward those who fear Him.
Isaiah 7:11
Ask a sign of Jehovah your God; ask it either in the depth, or in the height above.
Isaiah 55:9
For as the heavens are higher than the earth, so are My ways higher than your ways, and My thoughts than 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 Solomon exceeding great wisdom and understanding, and largeness of heart, even as the sand that is on the seashore.
1 Peter 1:7
so that the trial of your faith (being much more precious than that of gold that perishes, but being proven through fire) might be found to praise and honor and glory at the revelation of Jesus Christ,

General references

Isaiah 55:8
For My thoughts are not your thoughts, nor your ways My ways, says Jehovah.