Summary: You mean it is not all about me?
1 We then that are strong ought to bear the infirmities of the weak, and not to please ourselves.
2 Let every one of us please his neighbour for his good to edification.
3 For even Christ pleased not himself; but, as it is written, The reproaches of them that reproached thee fell on me.
Ever since the hippie movement we have moved into an age of the worship of self. It is all about me is the guiding principle of the age. People are about what is in it for them and makes them feel good or what advances their goal. This has infiltrated the Church in many ways because it has been adopted by many Christians. We have forgotten that Christianity is all about Jesus and the will of God, and others, not about us.
Many splits in churches are because somebody was unhappy about how things were done or something offended someone with influence. They then used that influence to try and work their own will. If there were not enough numbers to make it happen they lead their people off to start another church.
Doctrine is the real reason to split a church. If the leadership starts teaching error and no proper use of Matthew 18 effects a return to sound doctrine then those who know the truth should leave, but another church may not be needed as there may be several in the area teaching the truth. Seek those out and support them in the spirit of unity.
Many seek churches to just fulfill their needs. Sometimes that might be a particular type of music, age group, a coffee bar or something. Some think the Church is Welfare Part II. Doctrine is not important to people as it should be. In the church life, we have people at different maturity levels and often from many backgrounds. That means there could be many opinions of how something should be done or things that Christians should or should not do. Do we seek the good of the Body or our agenda?
In Romans 14 and 15 Paul is dealing with the merging of Jews and Gentiles into one Church, not gray areas as many teach. Now that is a monumental task since the cultures were as opposite as opposite can be. One very zealous for the Law of Moses and the rituals and traditions and the other having no such background and not interested in them once they heard the Gospel and especially since the Jerusalem Council released them from such observances. This created friction and the friction was generating great heat as it does still today.
He just spent all of chapter 14 telling the Church that stronger Christians were the ones who did not concern themselves about days and foods. Still no one was to judge the one on the other side or abuse the weaker brother. Tough he said the Gentiles had it right, he also told them to not cause their Jewish brethren to stumble. He said that he would not eat certain foods forever rather than cause his weaker brother to stumble.
He drives it home in these first three verses of chapter 15. Listen up strong people, you are not to bask in your strength and hurt people because you are right. You are to do what is necessary to help people get to where you are, not make them stumble and fall because you have to exercise your rights! It is not about you. You are not to please yourself. You are to edify your neighbor and bear the infirmities of the weak.