Steven at Flos Carmeli writes:
...the most useful, most effective, most reliable means of defending one's faith is to live it as it is meant to be lived, without stint, without quibble, without making a point of it.
It also occurred to me that this is by far the most difficult means of defending one's faith--one that, while not reserved to Saints, certainly most effectively demonstrated by them. Some of these Saints also defended their faith in other ways--in physical battle, in intellectual battle, in protracted debate. But others did not so engage, and yet they still won the hearts and minds and souls of a great many. I guess I would say that living your faith in its entirety is a precursor to being able to defend it in any intellectual capacity.
This pretty much describes what I feel St. Francis was calling his followers to do when he said, "Preach the Gospel at all times. If necessary, use words." In other words, JUST DO IT.