The goal of every Catholic is to glorify God. We do this by becoming saints and we do that by being holy in this life. Another grace in living a life of holiness is that you can be a source of grace for others. In this we find for ourselves a great challenge. And so I'd like to offer this quote from St. Jean Vianney, who said all of that much more succinctly:
"What will convert [insert name here] is the sanctity of your own life!"