In 1977, singer Debbie Boone recorded “You Light Up My Life.” The song quickly shot to the top of the charts and became one of the biggest hits in the 1970s. While the song was originally written as a romantic love song, Boone claimed to sing it to God.

One of the most familiar lines in the song says, “It can’t be wrong when it feels so right.” That’s certainly true when it comes to our drawing close to the pure presence of our Creator. And it can sure seem right in human relationships too—but that’s not always the case. They can most definitely be wrong even though they feel right.

Take King David. I have no doubt that when he watched Bathsheba bathe and then took her into his bedroom, she lit up his life. It felt so “right” and easy to justify enjoying the charms of another man’s wife (2 Samuel 11:1-4). That’s the deceptive nature of any form of sexual immorality. But the excitement never lasts. In fact, it’s like the calm before the storm.

David’s infidelity with Bathsheba erupted into a pregnancy, murder, a cover-up, and ultimately the death of an innocent child (2 Samuel 11:5–12:18). In a sexually permissive world where we’re bombarded with the message “if it feels good, do it,” it’s important to remind ourselves and each other of the bigger picture.

What makes marital infidelity—and any form of sexual immorality—wrong is its destructive nature. Indulging in it eats away at our hearts and tears apart our relationships. Most important, it’s sin in God’s eyes.

Now, God isn’t trying to take the pleasure out of life when He prohibits sexual sin. Instead, He’s a loving Father who is trying to protect His children from doing great harm to themselves and others.