This quote from Archbishop Charles J. Chaput in his new book Render Unto Caesar speaks about the importance of our actions corresponding with what we profess with our tongue.
"Laypeople have the special task of evangelizing the secular world. And this makes sense. Most Catholics - the vast majority - are laypeople. They have jobs, friends, and families. They can witness Jesus Christ on a daily basis, silently or out loud, directly or indirectly, by their words and actions. If we look for opportunities to share our faith with others, God always provides them. This is why self-described Catholics who live so anonymously that no one knows about their faith, Catholics who fail to prove by their actions what they claim to believe with their tongue, aren't really living as 'Catholics' at all."