1 John 1:3-4: Real Fellowship
1 John 1:3-4: That which we have seen and heard we proclaim also to you, so that you too may have fellowship with us; and indeed our fellowship is with the Father and with his Son Jesus Christ. 4 And we are writing these things so that our joy may be complete. 
The last blog discussed how John is trying to keep believers from leaving the church by defending his apostleship.  In verses 3-4, John continues to counter false beliefs about Christianity by explaining that true fellowship with God and Christians, and true joy only come through the apostles’ teaching—teaching that is affirmed by the whole Bible.  The crucial key to biblical fellowship hinges on knowing the Triune God in Christ: that His blood pays for the forgiveness of sins, and His continued work in our lives.  Any fellowship claiming to be Christian that lacks these elements is not true biblical fellowship.
This is why doctrine is so important! If we do not rightly understand Scripture, how can we claim to fellowship with God and His people and have His joy?  Whether or not you would call yourself a Christian, you need to study the apostles’ teaching. What Christ’s apostles taught is in harmony with the whole Bible, which reveals our sin and our need for a Savior.  What Christ’s apostles taught is that that Savior is exclusively Jesus, Who alone brings us into fellowship with God and man.  What Christ’s apostles taught leads to lasting joy even in suffering.  These things are yours only in Christ, as the apostles taught.
This blog was written by Seth Dunn
 Colin G. Kruse. The Letters of John. General Editor: D.A. Carson. (Grand Rapids, MI: Wm. B. Eerdmans Publishing Co., 2000), 52-53.
 Joel Beeke. The Epistles of John. (Webster, NY: Evangelical Press, 2006), 25-26.
 Beeke, The Epistles of John, 26.
 Beeke, The Epistles of John, 27. See also John 15:11, 16:24, 17:21; 1 Corinthians 1:9; 1 John 1:1, 2:24.
 Luke 24:39-50; Acts 2-3; Galatians 3; 1 Peter 2, etc.
 John 14:6; Acts 2:42, 4:12; 2 Corinthians 6:14; Ephesians 1:3-10, 2:1-10, 1 John 1:5-10.
 2 Corinthians 1:3-10; Philippians 4:11-13; James 1:2-4; 1 Peter 1:3-12.