Don't be afraid that you'll be drawn in to apostasy, we have the Holy Spirit. John wrote with confidence that he group he was writing to knew the truth. Truth doesn't change, we do. The Gnostics of John''s day were trying to lure Christians away from a complete faith in Christ's complete work. Beware any teachings that place the focus on man. Beware the teaching which demphasize the promise of eternal life. Believers do not live FOR now though they live in now. John tells the Christians that they do not need to hear what the False teachers were teaching. The things that the Christian's had been taught by the Apostles are true.