Sentence:  It's reform -- reform! You're going to 'turn over a new leaf,' and all that, and sign the pledge, and quit cigars, and go to work, and pay your debts, and gravitate back into Sunday-school, where you can make love to the preacher's daughter under the guise of religion, and <WSD>desecrate</WSD> the sanctity of the innermost pale of the church by confessions at Class of your 'thorough conversion'! 
Meaning of the word marked with <WSD> tags:  To profane or violate the sacredness or sanctity of something.