The subject matter is a quote from by father-in-law, a staunch. knows-no-better-all-his-life-a-JW, which although said with a touch of humour, contains a measure of credibility as to how JW's can justify a lot of their actions. They have no conscience, or, if they do, they 'deaden' or numb it, to allow them to continue on their course.
Just call me holey_cheeses.