We likewise influence others by what we fail to say or do. We see this quite often in respect to various hot issues in today’s culture. How often do we hear ourselves or others say “I'm not saying I agree or disagree” thus avoiding being seen as taking a position on either side, lest we be perceived as being politically incorrect. This is why this whole homosexual “marriage” thing is gaining support, because people are reluctant to take a position. We especially see this among the young who are so easily influenced. Yet by not taking a position, not speaking out on matters which are clearly disordered, we lend support and normalcy to matters which are clearly wrong. Sometimes the strongest argument against Christianity comes from within the pews and from the pulpit.
Peter Kreeft notes in his writings on Fundamentals of the Faith: Essays in Christian Apologetics: “G. K. Chesterton once said that the only unanswerable argument against Christianity was Christians. (He meant bad and sad Christians.) Similarly, the only unanswerable argument for Christianity is Christians—saintly Christians. You can argue against Mother Teresa's theology if you are sceptical of mind, but you cannot argue against Mother Teresa unless you are hopelessly hard of heart.”