Whether or not he ever said it, the well-known saying "Preach the gospel by all means possible and if you can find no other way, then use words" will probably continue to be attributed to St Francis of Assisi. It picks up a popular sentiment, the idea that actions speak louder than words, something that I think is particularly true of Australian culture. On the whole, we don't like to trumpet about our successes (except of course in sport) and many would rather just get the job done, avoiding the spotlight wherever possible.
1 John 3:18 gives a good scriptural reference for this way of living "Let us love, not in word or speech, but in truth and action". What have your actions said on your behalf today?