A big theme in the bible is the heart, it appears over 900 times in the bible, so it is very important.
Everything comes out of the heart. A good man brings good things out of the good stored up in his heart, and an evil man brings evil things out of the evil stored up in his heart. For the mouth speaks what the heart is full of (Luke 6:45). Your words, actions, thoughts, and motives are a reflection of your heart. For example, girls love clothes, they buy it, wear it, talk about it, and even brag about it (you can love Jesus, and still have a passion for clothes); By knowing what people do and say, you know what is in their hearts.
As water reflects the face, so one’s life reflects the heart (Prov. 27:19).
Above all else, guard your heart, for everything you do flows from it (Prov. 4:23).
A person thinks their own ways are right (Proverbs 21:2). Why? Because we are prideful, we constantly try to justify our sin, we will even go to scripture and try to find a verse that justifies our sin. That’s why Romans 12:3 says, “We should not think of ourselves more highly than we ought, but with sober judgment.” When you take a sober look at our heart you will find that we all have fallen short of the Glory of God and no one is righteous. There is a way we can have our heart transformed by God.
God will give you a new heart and put a new spirit in you; He will remove from you your heart of stone and give you a heart of flesh (Ezekiel 36:26). In context, God promised to restore Israel not only physically, but spiritually. He wants the same for us, no matter how impure you are you can receive a new heart from God, and be a new creation, with new desires (2 Corinthians 5:17). Having a new heart you will receive a new spirit, and God will dwell in you.
With A New Heart You
Become a new creation
Everyone has or is an old creation. When we were an old creation we were in constant rebellion against God, set apart from him because of sin. When Christ makes us a new creation, we turn completely around and go towards him.
Have new desires
Whatever we do comes from our desires.
Romans 3:10-12 As it is written: “There is no one righteous, not even one; there is no one who understands; there is no one who seeks God. All have turned away, they have together become worthless; there is no one who does good, not even one.”
All of our desires before Christ are not good, not even one. With a new desire we are able to do good through Christ.
And the verse that summarizes the life we have through Christ.
All of us also lived among them at one time, gratifying the cravings of our flesh and following its desires and thoughts. Like the rest, we were by nature deserving of wrath. But because of his great love for us, God, who is rich in mercy, made us alive with Christ even when we were dead in transgressions it is by grace you have been saved. And God raised us up with Christ and seated us with him in the heavenly realms in Christ Jesus, in order that in the coming ages he might show the incomparable riches of his grace, expressed in his kindness to us in Christ Jesus. For it is by grace you have been saved, through faith and this is not from yourselves, it is the gift of God not by works, so that no one can boast. For we are God’s handiwork, created in Christ Jesus to do good works, which God prepared in advance for us to do.