Short answer: most evangelicals attribute 1 John (including 1 John 3:18) to John the Apostle — the “beloved disciple” who also wrote the Fourth Gospel — and read the letter as an apostolic, eyewitness, pastoral tract that teaches Christian assurance, the incarnation of Christ, and love lived out in action.

Key points an evangelical would emphasize

– Who the author is
– John the son of Zebedee, one of Jesus’ inner circle (brother of James), traditionally identified as the “beloved disciple” of the Gospel of John. He is understood as an eyewitness of Jesus’ ministry and resurrection and, in later life, a leading pastor/teacher in the Johannine community (often located in Ephesus).

– Why evangelicals accept this authorship
– Early church testimony: leaders such as Irenaeus, Clement of Alexandria, and others attribute the Gospel and the epistles to John the Apostle.
– Internal affinity with the Gospel of John: shared vocabulary and themes (light/darkness, life, love, truth, Son/Sending) and similar theological emphases support a common authorship or close association.
– Pastoral tone and eyewitness claims fit an apostolic, authoritative address to churches facing false teaching and pastoral questions.

– Historical context and purpose
– 1 John was written to counter false teachers (often described as denying the full reality of Jesus’ incarnation and/or living in persistent immorality) and to give assurance to believers. The letter stresses that true Christian identity is shown both by belief in Jesus (the incarnate Son) and by obedient, self-giving love.

– How that relates to 1 John 3:18
– Text (NIV paraphrase): “Dear children, let us not love with words or speech but with actions and in truth.”
– From an evangelical pastoral reading: this verse reflects John’s consistent concern that Christian profession be matched by moral and practical reality. Love is not merely sentimental or verbal; it is sacrificial, concrete, and verifiable. This practical love is rooted in the truth of who Christ is and what he has done.

– Theological emphases an evangelical would stress
– Incarnation and Christology: Because John insists on the reality of Jesus’ humanity and saving work, authentic love derives from the gospel of the incarnate Son.
– Assurance and ethics: Assurance of salvation is evidenced by love and obedience; ethical behavior is not a means of earning salvation but the fruit and test of genuine faith.
– Opposition to false teaching: The call to love in deed and truth also serves to expose false teachers whose claims are not accompanied by Christlike life.

– Practical application (how many evangelicals use the verse)
– Encouragement to show gospel love in concrete ways: serving the needy, sacrificial help to fellow Christians, truth-speaking combined with compassionate action.
– A corrective against cheap sentimentalism or purely verbal piety: faith must be embodied.

If you want, I can:
– Lay out the main internal and external evidence for Johannine authorship in more detail,
– Summarize how different evangelical commentators treat authorship and context,
– Suggest specific evangelical commentaries and study-Bible notes that treat 1 John.