Jeremiah 17:9
The heart is deceitful above all things, and desperately sick; who can understand it?
Psalm 51:10 ESV
Create in me a clean heart, O God, and renew a right spirit within me.
Ezekiel 36:26
And I will give you a new heart, and a new spirit I will put within you. And I will remove the heart of stone from your flesh and give you a heart of flesh.
John Hargrove Seeking Truth and Reality 