Day 250 Why not use disagreements for God's grander purposes?

Paul and Barnabas had a disagreement. Barnabas wanted to take John Mark. Paul had seen enough from John Mark's homesickness. They disagreed and went different directions. What happened positive? The church grew in two directions instead of one! East and West. We are all products of this disagreement that turned out well. Why not use disagreement for God's grander purposes?