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. John, Chapter 15, verse 4.
In this comparison, Christians are the branches and Jesus is the vine. If a heavy wind had broken a branch off, that branch could not continue to produce grapes year after year on its own. People who stray away from Jesus lose their focus as Christians if they don’t have an ongoing relationship with Him. The branch needs a vine with a strong root system to get nourishment up through it; into the branches and into the grapes. Christians rely heavily on the nourishment that Jesus gives them through His Word (the Bible) to help us grow as His examples for others. In this same way, we rely on Jesus, who also relies on us to be productive by sharing our faith with others.
Since this is an example of how I apply this Bible passage to my life, it doesn't necessarily reflect the whole meaning of the passage.