John Wesley, in his sermon Christian Perfection, warns us against causing or furthering division in the church. According to him, disunity leads to separation. In this paragraph, Wesley reminds us that our apprehension at the thought of being separated from our brothers and sisters should far outweigh our desire to be proven right in opinions that are not vital to the furthering of the Gospel.
Do not even give a single thought of separating from your brethren, whether their opinions agree with yours or not. Just because someone does not agree with everything you say does not mean they are sinning. Nor is this or that opinion essential to the work of God. Be patient with those who disagree with you. Do not condemn those who do not see things just as you do, or who think it is their duty to contradict you, whether in a great thing or small.