In the workplace, words of encouragement matter. How employees talk to one another has a bearing on customer satisfaction, company profits, and co-worker appreciation. Studies show that members of the most effective work groups give one another six times more affirmation than disapproval, disagreement, or sarcasm. Least productive teams tend to use almost three negative comments for every helpful word.

Paul learned by experience about the value of words in shaping relationships and outcomes. Before meeting Christ on the road to Damascus, his words and actions terrorized followers of Jesus. But by the time he wrote his letter to the Thessalonians,…