John 15: central idea

Elmer Towns gives his idea on the central idea of John 15: "The foundation of the Christian life is the believer's union and communion with Christ, which is the central truth of the metaphor of the vine and the branches. One cannot read the New Testament without realizing the tremendous importance early Christians placed on the fact that they were in Christ and Christ was in them.... Spiritual life and fruitfulness have their source in Him and are manifestations of the reality of that union."

The Gospel of John,Believe and Live, Elmer Towns p 149-150