"there must be great scrutiny and much analysis on his part" in order to reach absolute cleanliness and have anything stick to him from money that isn't his requires great scrutiny- meaning to reflect a lot, and much precision. the scrutiny is the mental introspection, and the precision concern the practical aspect to be precise in what he does and see that it fits the guidelines of scrutiny that he has implemented for himself and that he has set for himself regarding cleanliness. 