You MUST "bear fruit" or of no use to Jesus! Matthew 21:33-44 (another parable) (v42) Did ye never read in the scriptures, The stone which the builders rejected, the same is the head of the corner; this is the Lord's doing, and it is marvelous in his eyes? (v43) Therefore I say unto you, The Kingdom of God shall be taken from you, and "given to a nation bringing forth the fruits of it." What? He shall make the first last and the last first? (Mk 9:35) What? He will make the rocks cry out? (Lk 19:40) What? He will get His WILL accomplished? (Is 55:11) What? Fruitless and He will take it from you? Therefore, not "being fruitful" will cause The Kingdom of God "to be taken from you and given to a nation bringing forth the fruits of it."
The same it is with the Kingdom of God in you! Unfruitful, it will be taken from you!