The document summarizes a passage from 1 John discussing the author's motive for writing. The author states that they witnessed Jesus firsthand and are now sharing their experience of communion with God so that others may enjoy it as well and their joy may be doubled. The passage discusses how God is pure light with no darkness, and that if people claim to have fellowship with God but continue in darkness, they are lying, but if they walk in the light, they can have fellowship with God and each other through Jesus' sacrifice which purges sin.