Christ is extolled by the aged apostle as truly man and God, who is holiness and truth, genuine believers being identified by their sensitivity to sin and concern for biblical obedience, and false Christians by their relative indifference to one or the other.

John looks back sixty years recalling with amazement how the apostles listened to Christ, and watched Him through His earthly ministry, constantly convinced of His redeeming work, and by the wonder of personal fellowship with God. Here is the basis and joy of such fellowship.

The aged apostle speaks out of concern for believers everywhere, urging all to avoid spiritual lifelessness by keeping in full view: 1) The campaign for personal holiness; 2) The price Christ paid for us; 3) All His commands to serve Him; 4) Our love for Him. 

After extolling Christ and exhorting to holiness, the first topic of the epistle (showing its importance) is mutual love in the congregation. Here are the grounds of solid ties, and the blessings and helps, along with the Apostle's warnings about opting out of this precious duty.

John's words to little children, fathers and young men seem repetitive and puzzling at first sight, but they are a call to think of the considerable changes brought about in those who are converted, and to stir assurance and zeal. Here are the triumphs of grace.

In three famous verses, John shows that love for the world cannot coexist with love for God, then defines worldliness, shows its offensiveness to God, and describes how it passes away to judgement before our eyes. What believers do, however, lasts forever.