John 15:1-4 KJV
 I am the true vine, and my Father is the husbandman.  Every branch in me that beareth not fruit he taketh away: and every branch that beareth fruit, he purgeth it, that it may bring forth more fruit.  Now ye are clean through the word which I have spoken unto you.  Abide in me, and I in you. As the branch cannot bear fruit of itself, except it abide in the vine; no more can ye, except ye abide in me.