"For the people in this book, the sovereignty and goodness of God have become a sanctuary for the soul in a life they did not expect to live. When they affirm the goodness and wisdom of God in creating them for short-term disability and eternal super-ability, they do not do so without tears. There is no glib trifling with pain. They are learning the paradox of "sorrowful yet always rejoicing." They are learning how to be brought low and how to abound. They believe that in this fallen age, God's loved ones groan along with the whole creation, waiting for the fullness of adoption, the redemption of their bodies.
They find more hope in God's unsearchable wisdom and power and purpose than in the vagaries of natural processes or the assaults of Satan. They believe that God did not spare his own Son but gave him up for their complete renewal-spiritually and physically. This healing is as sure as Jesus is precious-infinitely precious. It is only a matter of time, a vapor's breath, and they will be whole. Because of the grace of God, these lives and this book exist for the glory of God."
John Piper.