The leaders are not the only ones responsible for the congregation's moral progress (4:18; 5:11). Paul urged the church to warn those who are lazy (unruly), and those who did not follow the apostles’ instructions (see 2 Thessalonians 3:6–15).
encourage the fainthearted, help the weak: Greek society thought poorly of people perceived as weak in some way.
Instead of being annoyed, Christians should be patient in their relationships (Galatians 5:23; Ephesians 4:2).