Historical

Toward readers themselves

Verify their own salvation

Examine carefully the Scriptures

Remain holy until His coming

Toward the antagonists

Be on guard against those who espouse false doctrine

Preaching Application

Toward believers (and self)

Review your testimony and verify its impact on your life

Study the Word of God toward understanding

Remain holy until His coming

Toward erring believers

Oppose false doctrine when it clearly contradicts Scripture

Specific Applications

Toward believers (and self)

Write out testimony and list the fruit of the Spirit daily experiencing

Study a book of the Bible every month for doctrinal soundness

Flee from sin; secure an accountability partner

Toward erring believers

Remain attuned and educated on false doctrine within and outside the church