But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus Christ, his Son, cleanses us from all sin.
"One another" evidently means God and us rather than our fellow believers and us in view of the context. We share the light in which God dwells. Another view is that John meant that we cannot enjoy fellowship with God if we neglect fellowship with other Christians. [Note: Barker, p. 310; Westcott, p. 20.] 