Setting a good example

I started wrestling about a week ago and I found out my Coach was a Christian. He told my fellow wrestlers not to say any filthy words and not to put Jesus Christ's name in vain. I thought he would be a pretty good coach untill he started cussing. That doesn't show a good example to the wrestlers about being a Christian when our coach condradicted himself. It made me think about when I'm hanging around non-christians and how I should set a good example for a christian. Just one word that could easily slip out could ruin their thoughts about christianity. Expecialy me being a teen minister and our campus lunch leader for our school. As christians, we need to be extra carefull about what we do when around non-christians.