Wedged between your lungs in the middle of your chest lies your heart. Your heart is actually two pumps in one, pumping oxygen poor blood to the lungs and then oxygen rich blood from the lungs to the rest of the body. Your heart measures about the size of your fist and weighs about one pound. (The heart of a blue whale weighs about 1500 pounds!) It is hard at work 24 hours a day, seven days a week, every day of your life, resting only very briefly between beats. Every day your heart beats about 100,000 times (2-3 billion times in a lifetime), pumping 2000 gallons of blood, at the rate of 1½ gallons per minute, through 60,000 miles of blood vessels to 76 trillion cells (all the cells except for the corneas that don't receive blood). Your heart works hard keeping you alive day by day.
God says in His Word, the Bible, that you must "love the LORD your God with all your heart, with all your soul, and with all your might (Deuteronomy 6:5).
When God speaks of the heart He is not talking about your physical heart in the center of your chest. No, He is talking about your person--YOU--alive in your body, your soul and spirit. He speaks of the YOU that thinks and feels, that loves and hates, your invisible person.
As God looks at YOU, He sees heart trouble--The heart is deceitful above all things, and desperately wicked: who can know it? (Jeremiah 17:9). For all have sinned, and come short of the glory of God (Romans 3:23); and the wages of sin is death (Romans 6:23). God sees and knows our hearts. We are headed toward eternal death, forever separation from God Who is holy and perfect and righteous and good. Our outlook is not good. But God has the solution. God is the solution.
A new heart also will I give you, and a new spirit will I put within you . . . Ezekiel 36:26. Because of the work of God's Son, the Lord Jesus Christ, in taking your place, dying for your sin and rising again, God offers the free gift of forgiveness of sin and everlasting life. For God so loved the world, that He gave His only begotten Son, that whoever believes in Him should not perish, but have everlasting life (John 3:16). Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved (Acts 4:12). Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new (2 Corinthians 5:17).
. . . What must I do to be saved? . . .
Believe on the Lord Jesus Christ, and you will be saved