Want to “shine among” lost co-workers? Do this.

Do everything without grumbling or arguing, so that you may become blameless and pure, “children of God without fault in a warped and crooked generation.” Then you will shine among them like stars in the sky. (Philippians 2:14-15)

Want to “shine among” the non-Christians you work with? Paul tells you how: “Do everything without grumbling or arguing.” Apparently, working without grumbling and complaining was as countercultural in Paul’s day as it is in ours.

C.S. Lewis once said that, “Hell begins with a grumbling mood.” The inverse is also true. People can get a whiff of heaven through the joyful mood of its citizens. Dr. Randy Alcorn goes so far as to say that, “Happiness in Christ is one of our most powerful evangelistic tools.”

The question, of course, is how can we be joyful and work without grumbling when your co-worker replies all to yet another email or your boss makes an urgent request at 4:45 on a Friday? By focusing on what Christ has done for us.

Just a few verses before today’s passage, Paul writes about how Christ “humbled himself by becoming obedient to death” for you and me (see verse 8). “Therefore,” Paul says in verse 14, “do everything without grumbling or arguing.”

The cross is the source of our joy amidst less than desirable circumstances. Once you focus on what Christ accomplished for you at Calvary, grumbling about the smell in the office refrigerator feels ridiculous. Tim Keller once compared it to being a “spiritual billionaire…wringing your hands over ten dollars.”

Grumbling is so second nature we often don’t notice we’re doing it. Here are three simple ways to prevent, confess, and respond to complaining.

First, prevent grumbling by writing Philippians 2:14-15 somewhere you’ll see it while you work. On a post-it note, your phone background—wherever.

Second, confess grumbling by creating a grumble jar. And every time you or someone on your team complains, drop in a dollar (or, if you’re like me and never carry cash, an IOU to tally later). My family and I did this recently to break a different habit and it was shockingly effective. We were able to kick our habit in less than a month. 

Finally, respond to grumbling by expressing gratitude. Think back to the last thing you complained about and thank God for something related to that thing. For example, this morning I grumbled about the house being a mess. But I then said a quick prayer of gratitude that I have children to make said mess.

Do whatever it takes to wrestle your grumbling to the ground, believer. Because as Dr. Alcorn put it, “Our happiness makes the gospel contagiously appealing; our unhappiness makes it alarmingly unattractive.”