About fruitfulness for God:

"No good tree bears bad fruit, nor does a bad tree bear good fruit. � Each tree is recognized by its own fruit. People do not pick figs from thornbushes, or grapes from briers. � The good man brings good things out of the good stored up in his heart, and the evil man brings evil things out of the evil stored up in his heart. For out of the overflow of his heart his mouth speaks. � "I am the true vine, and my Father is the gardener. � He cuts off every branch in me that bears no fruit, while every branch that does bear fruit he prunes so that it will be even more fruitful. � You are already clean because of the word I have spoken to you. � Remain in me, and I will remain in you. No branch can bear fruit by itself � it must remain in the vine. Neither can you bear fruit unless you remain in me. � "I am the vine � you are the branches. If a man remains in me and I in him, he will bear much fruit � apart from me you can do nothing. � If anyone does not remain in me, he is like a branch that is thrown away and withers � such branches are picked up, thrown into the fire and burned. � If you remain in me and my words remain in you, ask whatever you wish, and it will be given you. � This is to my Father's glory, that you bear much fruit, showing yourselves to be my disciples. � "As the Father has loved me, so have I loved you. Now remain in my love. � I no longer call you servants, because a servant does not know his master's business. Instead, I have called you friends, for everything that I learned from my Father I have made known to you. � You did not choose me, but I chose you and appointed you to go and bear fruit--fruit that will last. Then the Father will give you whatever you ask in my name. � This is my command: Love each other. � 

Verse References In The Order Presented Above -- Luke 6:43 ; Luke 6:44 ; Luke 6:45 ; John 15:1 ; John 15:2 ; John 15:3 ; John 15:4 ; John 15:5 ; John 15:6 ; John 15:7 ; John 15:8 ; John 15:9 ; John 15:15 ; John 15:16 ; John 15:17