Maybe it’s too intuitive, but the first rule to prevent division in the churches ought to be to stop dividing. Overly simplistic? Maybe not.
Provided our brother hasn’t departed from the gospel, is not engaged in immoral conduct or character, and is not being divisive (advocating division), there is no reason that brotherly love can’t overcome all other scruples.
1 Corinthians 12:24-25 – But God has combined the members of the body and has given greater honor to the parts that lacked it, so that there should be no division in the body, but that its parts should have equal concern for each other. (NIV)
I can now live peaceably with those whose consciences have reached different conclusions than mine. Can you? I’d suggest that you already are. There are not two people in a congregation that share the exact same scruples. So let’s just take what we’re already doing and apply it to brothers we haven’t yet met.
But above all, let’s not divide the people of God or reject any one of them over his “error arising from weakness of mind“:
Romans 15:1 – We then who are strong ought to bear with the scruples of the weak, and not to please ourselves.