How do we know that Christian unity is important?

Christian unity is essential as it serves as both a witness to the world and a means of fulfilling the church's mission. Jesus prayed for this unity in John 17:21, stating that believers may be one so that the world may believe that the Father sent Him. This unity, grounded in love, is what distinguishes followers of Christ from others.

The church's effectiveness in mission and growth hinges upon the members' unity, which embodies the love of Christ. 1 Corinthians 12 illustrates how all believers, as unique parts of one body, must work together harmoniously. When the church operates in unity, it showcases the transformative power of the gospel, attracting others to Christ, as pointed out in Romans 15:5-6, which calls for unity in glorifying God. Thus, disunity undermines the church's witness and diminishes its spiritual vitality.