Proverbs 14:10

10The heart knows its own abitterness,
and no stranger shares its joy.

Proverbs 20:5

5The purpose in a man’s heart is like bdeep water,
but a man of understanding will draw it out.

Proverbs 20:27

27 cThe spirit
Hebrew breath
of man is the lamp of the Lord,
esearching all fhis innermost parts.

Jeremiah 17:9

9 The heart is deceitful above all things,
and desperately sick;
who can understand it?
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