The heart (kardia) is a function of the mind.
The mind (nous) is also a function of the mind.
The Greek - nous - in the Bible is called the mind.
It is the part of your mind where a man takes in facts and details and are stored in memory.
The kardia (heart) is the part of the mind where a person has made his conclusions and convictions about life
A man THINKs with his heart. Its not about human emotions, though what you think in your heart
can cause one to have an emotional response.
“As a man thinks in his heart, so is he." Proverbs 23:7a.
You said in your heart: “I will ascend to the heavens; I will raise my throne above the
stars of God. I will sit on the mount of assembly, in the far reaches of the north." Isaiah 14:13
Too many are yet confused as to how the word "heart" was used by the ancients.
A new heart will be a heart that God instills with new thinking within!
Instills with the Word of God, which will transform him away from his old way of thinking.