“Be watchful, and strengthen the things which remain, that are ready to die, for I have not found your works perfect before God”
“Strengthen” means to fix, make fast, to set. The idea is to put something firmly in a location. The New Testament uses this word for establishing or stabilizing something.
Jesus wanted Peter to establish his brothers in Christ (Luke 22:32). Paul visited Rome that the saints might be established (Romans 1:11; cf. 1 Thessalonians 3:2, 13; 2 Thessalonians 2:17; 1 Peter 5:10; 2 Peter 1:12).
Stability comes from spiritual maturity.
God wants us to form spiritual stability. Many Christians are not spiritually fixed. They wobble from one doctrine to another and from victory to defeat.
It is one thing to be spiritual; it is another thing to be spiritually mature. Immature believers spend their lives blaming their problems on other people or their church. It is always someone else’s fault. “I am really a wonderful person. It is just that no one understands me; that’s all.” Mature persons take responsibility for their own failures. People who spend their time running other people down will not have any friends either. If these people can find a patsy, it makes them feel better.