Obedience is the fruit of the new birth. When a person has accepted Jesus Christ as their Savior, then God expects something of that person who is now His son. He expects us to be surrendered. He expects us to abide in His love. He expects us to constantly abide in His love. As we do, God changes us. Christianity is a lifelong process of growing from glory to glory into the image of Christ. We are never going to be finished, until we get to Heaven. Until then, when we yield, when we surrender, when we abide, the natural result of that is going to be fruit. The natural result of a branch yielded to the Vine is a changed life, a fruitful life.