A young Japanese woman’s book on decluttering and organizing has sold two million copies worldwide. The heart of Marie Kondo’s message is helping people get rid of unneeded things in their homes and closets—things that weigh them down. “Hold up each item,” she says, and ask, ‘Does it spark joy?’” If the answer is yes, keep it. If the answer is no, then give it away.

The apostle Paul urged the Christians in Philippi to pursue joy in their relationship with Christ. “Rejoice in the Lord always. I will say it again: Rejoice!” (Phil. 4:4). Instead of a life cluttered with…