If you are willing to think; the title of this entry makes as much sense as "Preach the Gospel, if Necessary Use Words." Usually credited to Saint Francis, ain't' necessarily so.
Sounds really sweet, but if all you do is "let your little light shine," expecting people to somehow reason that you are a follower of Christ...well, sorry..at best they will think you are a Mormon, because they have better public relations than the family of God.
As Mark Galli writes,
"Preach the gospel; use words if necessary’ goes hand in hand with a postmodern assumption that words are finally empty of meaning. It subtly denigrates the high value that the prophets, Jesus, and Paul put on preaching. Of course, we want our actions to match our words as much as possible. But the gospel is a message, news about an event and a person upon which the history of the planet turns.”
The Great Commission instructs us to go and teach, not go and hint...