We shouldn't try to convince people of the error of their ways unless they are already believers who straying out of the lane. Jesus did that. Although there was that one incident involving the money changers out in front of the temple.
As for reaching those who are truly lost, there are plenty of people out there who are struggling through life and looking for answers. Our behavior, our demeanor, the expression on our faces create an atmosphere, or a "spirit", a Holy Spirit, if you will, that strikes a chord within them that will prompt them to ask us where we get our peace and joy from. Boom! Then you got 'em hooked.
I can't remember who said it (I think it was Francis of Assisi or Augustine), but someone said, "Preach The Gospel at all times. If necessary, use words."
I'm not sure if this is the message this Francis was trying to get across but it should've been.
Wow....Paul's life would have been a lot easier if he'd only followed this advice. And so would have the lives of a lot of other believers.