How our Father must delight as His children begin to grow, as well. However, that growth process is supposed to continue as well. We are commanded to mature in our faith, to cry out for spiritual nourishment, and to grow in our knowledge of our Lord and Savior.
Just as our earthly children are still our children, no matter how old they get...nothing will cut the bond we have with our Heavenly Father, either. John 10:28b tells us that no one will snatch us out of His hand. He loves us with an eternal love--so strong that He died so that relationship could happen. We can be adopted, we are chosen. And all we have to do is believe and say yes. Wow.