Purpose for sharing and writing

These verses complete the opening movement begun in 1 John 1:1, where the writer stresses direct experience—seen and heard—before stating the purpose of that testimony. The logic moves from witness (“we declare”) to intended effect (“so that you also may have…”) and then to a second purpose tied to the act of writing (“we write… so that…”). This opening sets a relational aim: bringing readers into a shared life that is defined by connection to God and Jesus Christ, which frames the rest of the letter’s appeals and tests of belonging.

First John likely comes from late first-century Christian communities around the eastern Mediterranean, living under Roman rule and dealing with internal strains in belief and practice. Communication by short letters helped traveling leaders and local groups stay connected across distance. Claims of reliable testimony mattered because many people could not verify origins firsthand, and communities depended on trusted witnesses and shared teaching. The writer speaks as part of an “us” group that carries authority through experience and established relationships, aiming to strengthen unity and common life in the face of fracture.

Shared ground

The writer says the message being shared is not secondhand rumor but testimony: “what we have seen and heard.” That repeated emphasis presents the content as grounded in real experience, not private speculation.

The stated aim of sharing is relational: the readers are meant to have fellowship (shared participation) “with us.” The writer then connects that human fellowship to God: “our fellowship is with the Father and with his Son, Jesus Christ.” In the text itself, belonging with the writer’s circle and belonging with God are tightly linked, because the writer’s circle claims to already share life with the Father and the Son.

A second purpose is tied to the act of writing: “that our joy may be fulfilled.” The letter is meant to bring joy to its full measure, not merely to transfer information.

Where interpretation differs

Who “we/us” refers to. Some read “we” as the original eyewitnesses of Jesus’ earthly life (or those closely tied to them), because “seen and heard” sounds like direct contact. Others think “we” could include a broader group of recognized teachers in the community who preserve and pass on that eyewitness testimony.

Whose joy is in view in “our joy.” Some take “our” mainly as the writers’ joy (their joy is completed when readers share fellowship with them and with God). Others see “our” as deliberately shared—writers and readers together experiencing full joy as a united community.

Why the disagreement exists

The passage uses first-person plural (“we/us/our”) without naming individuals, and it does not explicitly define the boundaries of the group. Also, “our joy” can naturally be heard either as the writers’ joy specifically or as a collective joy that includes the readers.

What this passage clearly contributes

Explicitly, the text links proclamation and writing to a goal: creating shared participation centered on the Father and the Son (Jesus Christ). It also frames Christian community as more than social connection: fellowship with the writers is presented as fellowship that is anchored in God. As an inference from this setup, the letter’s later warnings and tests (elsewhere in 1 John) are likely aimed at protecting that shared participation and the joy connected to it (see 1 John 1:1 for the repeated stress on experience).