One of a number of reasons why there were disagreements in the church in Corinth was different people were following different leaders. Some felt Paul’s teaching was more important than Apollos’, and others preferred Apollos’ teaching. Both were teaching about Jesus and emphasizing love for your neighbor, but the people decided to fight about which preacher they preferred. They were missing the point of what both were teaching. Paul reminds them what they are building for eternity is what matters most.
Most people can probably look back on a time when they experienced a serious disagreement over something that really wasn’t important. It would be great to recognize that in the moment. When you find yourself in a disagreement with someone, pause to ask yourself: will this matter in heaven?