Are you happy with your current knowledge of God? Do you know His character and His will inside and out? Maybe you've read the Bible so many times that you don't think there is any more to learn about God?
You can always know more of God. Even though you grow for a billion years or more, you will still be merely scraping the surface of His great glory. If not through His word, through walking with Him amongst His people.
If you are not overjoyed to learn more of your Maker, after whom you are created, in His image, then seek it. Seek joy though knowing more of God.
The one in whom the Spirit dwells will receive much joy at the growing knowledge of, and communion with God. Share the joy.