"I am the true vine, and my Father is the husbandman... every branch in me that beareth fruit, He purgeth it, that it may bring forth more fruit" (John 15:1,2).
Jesus is addressing the disciples, whose lives were characterized by confusion and much trouble. He is not dealing with the world, but with the problems that the disciples would face in it. He is also giving the solution to their problems.
Jesus is the True Vine. He is our source of life (2). If we accept any other source, it will result in wounds and inward trouble. The Father will purposefully take away things in our lives that are not abiding in the Vine, because He wants us to be more fruitful. He is not a hard master; it is His good pleasure to give us the Kingdom (3). His purpose is always taking care of the branches to make way for the Word of God to be rooted and established in our lives (4).
It is after this process that we become clean. "Now ye are clean through the word which I have spoken unto you" (John 15:3). Marry wisdom (the application of the Word). Be teachable, abide in what you hear, and trust nothing outside of the Word of God as your source. The result is that fruit will be added to your life.