John 15.5: At the Last Supper, Jesus said to his disciples, "I am the vine, you are the branches. Whoever remains in me and I in him will bear much fruit, because without me you can do nothing." What Jesus meant was that without him we cannot be fruitful for God's sake. We can perform good deeds, but without him we are still stuck with our sins. In fact, to be good is not good enough, for Jesus wants us to be perfect as the heavenly Father – definitely we need his help here.