That sounds like a great book. Honestly, I don't think he'll have much time to read the book while at the MTC or on his mission. I served in Brazil and went through the MTC (missionary training center), etc. You could send it to him and he might get to read some of it on P-day (preparation day) which is only part of the day once a week (and typically spent writing letters home, laundry, recreation). Actually, it might depend on the mission president as far as what they are allowed to read...but I would think that a church book would be fine and I'm sure he would love it. I just think, logistically, he won't have much time to read it, ESPECIALLY at the MTC. I don't know if this helps at all...but good luck!