Calvin
- 5:18
- This verse cannot be taken to indicate that believers are totally free from sin, for if it were so, then the call to prayer preceding would be foolishness. The point, then, is that the believer will not be so led astray by sin as to abandon all religion and surrender to the devil. Likewise, the idea of being untouched by the devil implies not a complete freedom from his attacks, but a warding off of those attacks such that they don't penetrate to the heart. The believer may well sin, but remains such that they hate the sin that burdens them, and continue in the fear of God. The power, the tools, and the strength wherewith we resist the devil are all had of God, there is nothing here of the believer's own power. This is not a proof of free-will playing a part, as the free-willers would have it. (Jn 17:11 - Christ prayed that God would keep us while we remained in the world.)
- 5:19
- The general statements John has made regarding God's children are now applied to his readers, specifically. Only God's children can be truly faithful. Knowing ourselves to be such, we ought to do our utmost to prove it by our separation from the world, and our sanctity. This reminder is necessitated by the fact that the devil's hindrances are everywhere about us, ready to distract us from our course. "Then, in order to be well prepared for the contest, these two things must be borne in mind, that the world is wicked, and that our calling is from God." We must value that calling highly enough to resist all that opposes it. Since the world encompasses humanity in its definition, we ought to practice self-denial, as all that is worldly is under Satan's rule. Being as God is the one who has called us, we can be assured that we have His protection in opposing the machinations of the world and of Satan.
- 5:20
- Having shown the battle all around, he also reminds us that we can be strengthened to perseverance in knowing we fight under God's own banner, and moreso because we know the Son of God. In Him, we have come to know God beyond all doubting, and are thus enabled to stand firm in faith against all comers. We come to know the only real God by knowing Him who was the only completely real image of God. (Jn 17:3 - eternal life consists in knowing the only true God and His Son.) When we depart from Him, we cannot but become vain in our own devices. In Christ we have our understanding of God, because in Him, God manifested Himself in the flesh. (Col 2:9 - the fullness of the Godhead was in His physical form. 2Co 4:6 - He who shone out of darkness in former times, revealed His face in Jesus.) The light of the gospel shines for all, but Satan blocks many with blindness. Where that light has penetrated, though, it cannot be extinguished, although it may be smothered for a time. The knowledge of this unites us to Christ, and through Him to God. The same who shows us the way to God is God - Jesus, the Christ, the source of life. The Father is the source of life, but Christ is the fountain from which it flows. We are to seek no farther for God, when we have found His Christ.
- 5:21
- Having shown the true light, the true image of God; John concludes by warning us away from all idols and images, for we are inclined by nature to be easily led astray into worship of such things. We are warned to avoid all that provokes superstition; all that might turn us aside from true worship into gross superstition.