The Secret of Growing Old Without Losing Heart

"So we do not lose heart. Even though our outer nature is wasting away, our inner nature is being renewed day by day. For this slight momentary affliction is preparing us for an eternal weight of glory beyond all measure, because we look not at what can be seen but at what cannot be seen; for what can be seen is temporary, but what cannot be seen is eternal.

For we know that if the earthly tent we live in is destroyed, we have a building from God, a house not made with hands, eternal in the heavens."  

2 Corinthians 4:16-5:1