Ronald Knox said this quote

“ We Catholics have not only to do our best to keep down our own warring passions and live decent lives, which will often be hard enough in this odd world we have been born into. We have to bear witness to moral principles which the world owned yesterday and has begun to turn its back on today. We have to disapprove of some of the things our neighbors do, without being stuffy about it; we have to be charitable towards our neighbors and make great allowances for them, without falling into the mistake of condoning their low standards and so encouraging them to sin. Two of the most difficult and delicate tasks a man can undertake; and it happens, nowadays, not only to priests, to whom it comes as part of their professional duty, but to ordinary lay people...So we must know what are the unalterable principles we hold, and why we hold them; we must see straight in a world that is full of moral fog. ”