v. 13-21. CONCLUSION.
- Intercessory Love the Fruit of Faith (v. 13-17).
 - The Sum of the Christian's Knowledge (v. 18-20).
 - Final Injunction (v. 21).
 
21 [My] little children, guard yourselves from idols.
21. "Little children." This is a term of endearment addressed to all readers, irrespective of age.
"Guard yourself from idols." Contrast is one of the laws of the suggestion of thought. In this Epistle we have had light and darkness, truth and falsehood, love and hate, Christ and antichrist, life and death, righteousness and sin, the children of God and the children of the devil, the spirit of truth and the spirit of error, the believer protected against sin by the Only Begotten Son, and the world in the coils of the old serpent, the devil; and now we come to a fitting, practical, climacteric conclusion, "Worship the true God and eschew idols." We must bear in mind the environment of idolatry in which Christians in John's day lived, when every street and every house literally swarmed with idols, and magnificent temples and groves and seductive idolatrous rites constituted the chief attraction of Ephesus, the city of great Diana. Some of the Gnostic teachers were giving occasion for this warning against idols, by their sophistry that idolatry was harmless, or that there was no need to suffer martyrdom in order to avoid it. If it were sinful, it had no power to defile the spirit with the body, but the material envelope only. Says Bishop Westcott, "This comprehensive warning is probably the latest voice of Scripture."
