Where did the idea begin that unity meant never disagreeing?
One definition of unity that I feel best reflects the biblical idea is this: something whole or complete formed by combining or joining separate things or entities.
Someone once pointed out the diversity of Jesus' disciples: zealots (fighting against Rome), tax collectors (working for Rome), and fishermen (paying the taxes to Rome). The miracle of their unity lay in their following Jesus.
However, many times Jesus had to break up their arguments. What caused the friction? Pride. Jesus kept reminding them that it wasn't about them. After the ascension and the coming of the Holy Spirit, the somewhat cowardly, often prideful disciples became the courageous apostles spreading the Good News to the world and (most) dying for their faith.
What made the difference?
Although they had been with Jesus, they had not yet been changed by Jesus. Once their sins were paid for and they became filled with the Holy Spirit, their contemplations went from self-ward to God-ward. They saw disagreements as a means for improvement (as my Pastor pointed out from Acts 6:1-7). When all the Christians desired God's glory and the salvation of souls, their individual tastes and opinions became secondary (Acts 4:32-35).
Proberbs 27:17 says, "As iron sharpens iron, so one man sharpens another." How does iron sharpen iron? By the friction of rubbing the two pieces together. One of the best ways for our own sharp edges to be shaped is by dealing with people who annoy or disagree with us.
Jesus said, "If you love those who love you, what credit is that to you? Even 'sinners' love those who love them" (Luke 6:32). And to His followers He said, "By this all men will know that you are My disciples, if you have love for one another" (John 13:35).
Being cleansed by Jesus and having love for one another is how Christians become "something whole or complete formed by combining or joining separate things or entities" or, I would add, quirks and personalities.
The apostle Paul said, "If it is possible, as far as it depends on you, live at peace with everyone" (Romans 12:18). This verse infers that if you do nothing, there will not be peace. Peace is the action taken against the natural result of division. Solving differences of opinion is part of creating peace.
James explains how we are to view our internal struggle for our own way.
But if you harbour bitter envy and selfish ambition in your hearts, do not boast about it or deny the truth. Such “wisdom” does not come down from heaven but is earthly, unspiritual, of the devil. For where you have envy and selfish ambition, there you find disorder and every evil practice (3:14-16).Instead, James lays the framework in which we should deal with differences.
But the wisdom that comes from heaven is first of all pure; then peace-loving, considerate, submissive, full of mercy and good fruit, impartial and sincere. Peacemakers who sow in peace raise a harvest of righteousness (3:17-18).And how do we obtain this wisdom?
If any of you lacks wisdom, he should ask God, who gives generously to all without finding fault, and it will be given to him (James 1:5).Instead of viewing differences as a cause for parting, let's begin to think constructively about what God can do in and through us as we seek His wisdom, react in love, and pursue peace.