John 15:8

Further assurance of an answer is given in the fact that the γεωργός is glorified in the fruit-bearing branches: ἐν τούτῳ, “in this pre-eminently,” i.e., in your bearing much fruit, cf. John 6:29-30; John 6:40. So, rightly, Weiss and Holtzmann. For construction with ἵνα see Burton on Subject, Predicate and Appositive clauses introduced by ἵνα. ἐδοξάσθη ὁ πατήρ μου, ἵνα, etc. ἐδοξάσθη, proleptic; cf. John 13:31. The Father is glorified in everything which demonstrates that through Christ His grace reaches and governs men. καὶ γενήσεσθε ἐμοὶ μαθηταί, “and ye shall become my disciples”. The ἐμοὶ μαθηταί seems to mean: This is the relation you will hold to me, viz., that of discipleship. “A Christian never ‘is,' but always ‘is becoming' a Christian. And it is by his fruitfulness that he indicates his claim to the name.” Westcott.