James doesn't ease into this one. "You adulterous people! Do you not know that friendship with the world is enmity with God? Therefore whoever wishes to be a friend of the world makes himself an enemy of God" (James 4:4). He isn't writing to pagans. He's writing to believers, and he calls them adulterers, a word that only makes sense if there's already a marriage.
Which, as we saw last time, there is.
The Prophets Said It First
James didn't invent this language. The prophets used it all the time. Isaiah tells Israel, "Your Maker is your husband" (Isaiah 54:5). Jeremiah and Ezekiel describe Israel's idolatry as a wife who took everything her husband gave her and spent it on other lovers (Jeremiah 3:20; Ezekiel 16:32). John the Baptist calls Jesus the bridegroom (John 3:29).
So when James calls friendship with the world adultery, he's not exaggerating for effect. He's reaching for the exact category Scripture has used for this exact problem for centuries.
What He Does and Doesn't Mean
This isn't a call to hide from the world or tune out the culture. Jesus himself was famously a friend of sinners. What James names is narrower and more inward: taking on the world's values, priorities, and definition of a good life as if they were our own, and letting them slowly reshape what we want, rather than letting God's Word do that work.
Why the Word Matters
"Adultery" is a strong word, and I think that's the point. We like to file worldliness under minor drift. Everybody compromises a bit, nobody's perfect. James won't let us file it there. He puts it right beside the worst betrayal a marriage can suffer.
That changes how I look at my small compromises. The times I've let the culture, and not Scripture, quietly set my expectations for money, comfort, ambition, or relationships. They aren't neutral. According to James, they're the language of an affair, and I'd rather hear that from him now than discover it later.