This sermon emphasizes the transformative power of God's grace in changing our hearts, cleansing us from sin, and giving us a new heart filled with love and compassion. It highlights the need for a spiritual heart surgery performed by Dr. Grace, symbolizing Jesus, to remove the sinful heart and replace it with a heart like His. The sermon encourages gratitude, praise, and sharing the testimony of God's grace with others as a form of spiritual exercise.

My, I said, where is that horrible smell coming? He said, that's coming out of your heart. Well, I said, I did have heart. Oh, yes, he said, that's where that profanity's been coming from. That's for those old filthy jokes. That's your cesspool of sin! That's where it's got to come out. All of it's got to come out. I'm taking the whole thing out. I said, oh me, I forgot to ask you, where am I going to get another heart? He said, a friend of yours has provided one for you. Oh, I said, I'd like to meet him. Well, he said, it'll be a wonderful heart. He said, you'll get to meet him after the operation. He reached down and took that old dirty, cursed, lusty, filthy, fleshly heart out. Oh, how sick I was when that old heart came by my nose. And he threw it away. Horrible! That's what's wrong with you little girls without Christ right now. That's what makes you shoot dope. That's what makes you run off from your mother and daddy. Live in the hippie hives and don't die! You've got a bad heart! And you'll never be any different until your heart's changed. And that goes for every man and woman in Corpus Christi, Texas and around the earth. The operation is over. The incisions closed. And I'm breathing better. And the doctor said, you know, your eyes are brighter. There's color coming back in your cheeks. And I said, yeah, there's strength in my voice. And I want to thank you. My, I've never felt like this before. He said, I know it. And I said, now then, give me some information. When do you want me to come back for a checkup? Oh, he said, no checkup is necessary. This is permanent. When I do the job, it's done. And this will last throughout eternity. My, I said, isn't that wonderful? I said, do you have any suggestion? And he said, yes, I'd suggest some good exercises. I said, for instance. Well, he said, I believe I'd walk down the street and knock on doors and tell about Dr. Long, Dr. Grace. I believe I'd go tell what Dr. Grace did for you when he operated and took that old heart out. I said, are there any other exercises? Yes, he said, I believe it would be good to take some kneeling exercises like this. Get down and thank God for what he's done for you. That's a good exercise. And praise the Lord for all that he's done for the new heart that was given to you. And I said, amen. And so I started out at the book. I said, wait a minute. I was supposed to meet my friend who gave me this heart. He said, yes. Dr. Grace said to Jesus, would you come in, please? And Jesus came in. And when his robe fell aside, I saw a piercing place and a star here. He smiled at me. He said, I'm glad I got to give you my heart. And I said, I believe I'll start my exercises right now. Amen. Brother, I believe my hands ought to go up to Jesus for taking that old ugly, stinking, sinful, filthy heart and giving me a heart like his that made me love everybody. Yes, I've introduced you tonight to the two great doctors. Dr. Lord tells you what's wrong with you and what you've got to have. And Dr. Grace comes along to give you a new heart, perform the operation, and make you every withhold. The most wonderful thing I've ever found in all of my life is the grace of God. For by grace are you saved through faith. And that knowledge is saved. It's the gift of God, not of works, lest any man should boast. The songwriter must have known what he was talking about when he said, Marvelous grace of our loving Lord. Grace that exceeds our sin and our gift. You're marvelous grace.