D. Martyn Lloyd-Jones has a famous and classic sermon with the title, "But God." I heard it years ago and it was excellent. Looking up that title on the MLJ Trust website results in three sermons with that title popping up. I'm not sure which one is the famous one. Or whether it's the same sermon preached on different occasions. But here are the links:
https://www.mljtrust.org/sermons-online/ephesians-2-4/but-god-the-christian-message-to-the-world/
https://www.mljtrust.org/sermons-online/ephesians-2-1-10/but-god/
https://www.mljtrust.org/sermons-online/ephesians-2-4/but-god-2/
