Because Greg knows what disability does to a family. And he clearly sees God’s remarkable, sovereign grace:
I often wonder what it would be like to be a normal dad, of a normal family, with a normal son. I sometimes imagine sitting through an entire church service or ball game or date with my wife without having to answer an urgent alarm activated by Jake. I would probably have more friends, more time, and more worldly accomplishments. I would definitely have more pride.
In return, there would be less opportunity to recognize the amazing grace that God displays each and every day through the disability of my son. It is this grace that humiliates pride, humbles my soul, deepens my shallowness and allows me to see what is most important in life. From Wresting with an Angel, pp. 40-41
I learned from Greg and his publisher that it is better to purchase books directly from Cruciform Press than through other vendors like Amazon. It is also cheaper!
And for those outside of the United States, there is a PDF version available for sale, though you may want to contact the publisher before attempting to purchase.