A new heart also will I give you, and a new spirit will I put within you:  and I will take away the stony heart out of your flesh, and I will give you an heart of flesh. Eze 36:26.

Dr. Christian Barnard performed the first heart transplant on Dec. 3, 1967 in Cape Town, South Africa. It was touted as a medical miracle. However, the great Physician, the Lord Jesus Christ has been performing successful heart transplants for thousands of years. He has been taking sinful hearts and replacing them with new clean ones.  God did that the minute we trusted the Lord Jesus for salvation. The ultimate heart transplant! He transformed us instantly as we received Christ as Saviour.

Dr Barnard’s patient lived for 18 days but the heart that accepts salvation through Christ, will live forever.

Only God can make a heart transplant. Man is now doing that sort of thing regularly in the physical sense, but God has been doing it in the spiritual sense for a long time. When we come to Him, He gives us new life—we are born anew and given a new nature. Sometimes the gospel speaker might use the expression, "Give your heart to the Lord." Well, what would God want with that old, dirty, filthy heart of yours or mine? He doesn't want it. The heart is deceitful. He wants to give you a new heart. He is a heart specialist; He is the Great Physician.

Reading what the Bible prophets say about our heart is like going from one physician to another and getting bad news at every turn. Moses says that our hearts are proud and lifted up. Isaiah tells us that our hearts are dull and distant. Jeremiah declares the heart to be deceitful above all else and desperately wicked. Time for another opinion? No. We must go to the Lord, the great Physician, who searches the heart. He not only knows us best and loves us most, but He alone is able to change us. He always starts at the heart.  

Reflecting on the work of God in the human heart, the apostle Paul wrote: "Therefore if any man is in Christ, he is a new creature; the old things passed away; behold, new things have come" (2 Corinthians 5:17).

Into the  "new heart" God puts a new will, new purposes and resolves, new affections and new desires, new delights and joys, as well as possibly new sorrows and troubles. He places there a hatred of sin, and a desire to do those things that please Him.

Note:  you cannot have the new heart and the old heart at the same time.