Well it reminds me of this--- "Greater love hath no man than to lay down his life for a brother". The chaplain is willing to be guilty of trickery or lying (and risk losing his salvation for purposely committing a sin) in order to convince an inmate of the Truth---the truth that he might not otherwise have had the courage to believe. Why? Possibly because of the misrepresentation he'd witnessed from other more conservative and self-righteous clergy. Just my 2 cents--tarnished as they are--but I think IISamuel (particularly chapter 18) sets up a precedent for wise men going against the King's command for the right motive. Who am I to judge?

PS. Also, this reminds me of how so many parents are willing to lie to their children about Santa in order to create a sense of starry eyed hope. And how many wink at that?