I find that as a general rule, it's best to assume that people know what they're doing and what's best for them. So in this case I'd ask why he was doing it, wh

I find that as a general rule, it's best to assume that people know what they're doing and what's best for them. So in this case I'd ask why he was doing it, what his motivations were, etc. Aside: I'd assume that as his friend, you'd already know that it is common for Mormons to do this! In any event, if it's a life choice like this (or marriage, or a new career), then telling him that he's doing the wrong thing is not likely to result in anything positive, other than you feeling better (?) about yourself.