Let us therefore follow after the things which make for peace, and things with which one may edify another.
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Ambrosiaster
AD 400
Since disapproval leads to discord, Paul teaches us to be peaceful and to avoid arguments over eating or not eating. Instead, he encourages us to follow the way of upbuilding. Commentary on Paul’s Epistles.
This applies to both sides equally. The one must become peaceable and the other must not destroy his brother. Without peace it is impossible to edify anyone.