John 15
Fruitfulness is an infallible mark of true Christianity; the alternative is dead wood, and the exigencies of the vine metaphor make it necessary that such wood be connected to the vine.
The cleansing power of the word Jesus has spoken to his disciples, then, is equivalent to the life of the vine pulsating through the branches. Jesus’ word (logos) is not assigned magical power. What is meant, rather, is that Jesus’ ‘teaching’ (as logos is rendered in 14:23), in its entirety, including what he is and what he does (since he himself is the logos incarnate, 1:1, 14), has already taken hold in the life of these followers (cf. notes on 13:10).
The imagery of the vine is stretched a little when the ‘branches’ are given the responsibility to remain in the vine, but the point is clear: continuous dependence on the vine, constant reliance upon him, persistent spiritual imbibing of his life—this is the sine qua non of spiritual fruitfulness.
In isolation from him no spiritual achievement is possible. For the complementary truth compare “I can do everything through him who gives me strength” (Phil. 4:13).
15:6 The person who does not abide in me is an unbeliever who does not have a personal faith in Christ (see note on v. 4). The verse echoes Ezek. 15:1–8, where a vine failing to produce fruit is said to be good for nothing but the fire (see Heb. 6:7–8). Fire is a common Jewish and biblical symbol for divine judgment (e.g., Isa. 30:27; Matt. 3:12 par.; 5:22; 18:8; 25:41). Some take this “fire” to imply loss of reward for true believers, not eternal judgment for unbelievers, but this does not fit as well with the image of branches being entirely burned up by a fire. See also note on John 15:2.
The meaning then is that the Father is glorified both in the bearing of fruit and in their continuing to be disciples. In either case there is also the thought that discipleship is not static, but a growing and developing way of life. Always the true disciple is becoming more fully a disciple.
15:9 Abide in my love. Mutual love between believers and Christ is another element of this “abiding” relationship (see note on v. 4).
“joy” and “pleasure” must not be confused. “The joy of Jesus is the joy that arises from the sense of a finished work. It is creative joy, like the joy of the artist. It produces a sense of unexhausted power for fresh creation. This joy in the heart of Jesus is both the joy of victory (15:11), and the sense of having brought His Church into being.” It is an inspiring thought that Jesus calls his followers into joy. The Christian life is not some shallow, insipid following of a traditional pattern. It is a life characterized by “unexhausted (and inexhaustible) power for fresh creation.”