Romans 15:5-7 Now may the God of patience and comfort grant you to be like-minded toward one another, according to Christ Jesus, (6) that you may with one mind and one mouth glorify the God and Father of our Lord Jesus Christ. (7) Therefore receive one another, just as Christ also received us, to the glory of God. This is an encouragement that we should not allow "disputable" things to divide us. Bear in mind, this is dealing with things that are in dispute and not blatant sin.
Jon Courson makes this point on these verses that I found to be very interesting, "Something happens when we hear the Scriptures and study the Word together. There's a oneness of mind that takes place—even if we differ on certain interpretations or certain applications. That's why you will notice that when a person stops coming to Bible study and worship, slowly but surely, they no longer have one mind and one heart. It's not that they don't love the Lord. It's not that they're not saved." In other words, fellowship creates oneness. Lose the fellowship, lose the oneness.