Walking in truth
In essence, John tells his children to (1) walk in the truth, (2) obey the commandments, (3) love one another, and (4) guard the teachings of Christ so that they will not be deceived by antichrist.
An elder was a man whose life was exemplary and thus an example (1 Pet 5:3) worthy of the church’s imitation.
If love would appeal to their hearts, then truth would appeal to their minds.
John will go on to explain that love walks in obedience to God’s commands and is expressed in relation to one another (in this context note Paul’s magnificent description of love in 1 Cor 13:4–8). Truth, interestingly, is related to both belief and behavior. John’s interest in truth is not so much philosophical as it is spiritual and personal. Truth is that which is embodied in Jesus Christ (John 14:6), who he is and what he has done. John is especially concerned with the person of Christ in this letter (v. 7).
To maintain a healthy and growing community the church must exhibit a fidelity to the truth that knows no compromise, and they must love one another in a way that knows no boundaries.
Grace, mercy, and peace “flourish in an environment where truth and love prevail.