Abide in me,

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. I am the vine, ye [are] the branches: He that abideth in me, and I in him, the same bringeth forth much fruit: for without me ye can do nothing. (John 15:4-5)
We cannot do anything without the Lord. He is the vine; and just as the branches receive their life-giving nutrients through the vine, so we as Christians receive the things we need for life from Christ. When a branch is apart from its source of life, it is dead. And so it is with us—until we are grafted onto that eternal and life-giving vine of Christ. We abide in Christ by our faith in Him and the salvation he offers. By this faith, even we shall bear fruit.