It's so easy to get our eyes off of being living vessels of God and instead becoming critical of the Brotherhood by the temptations of our flesh. While it is not wrong to judge with righteous judgement, it is important to use that judgement to help others rather than to merely condemn or complain about them. The "Strong" Brother looks for ways to restore others to usefulness to God.
In Romans 15 Paul the Apostle teaches us that Strong Faith is not about being critical or decisive towards those of other convictions or doctrines but rather as opportunities to help edify and unite the weaker brother in the truth and to help them to become better living vessels of God. More important than division of errant or "weaker" brothers is the work of restoration.