As believers in Christ, we are being watched and therefore we have an opportunity. When I was in my twenties, I worked my way through Bible school and Seminary. Most of my jobs were through the temporary agency called Manpower. Temporary jobs alternated between short one day jobs and jobs that lasted more than a year. One of those long term jobs was working for Chrysler Corporation in their complaint department.
On this job it was myself and another temp was took the phone calls of people angry about their cars. Often those calls came with yelling and cussing from the customers. That gets really old after a while. The other temp who took the calls with me was not a Christian and his response to people was sometimes to get angry right back, slam the phone down and walk out of the room. Though I may have wanted to do that, I decided that was not the way I should respond.
Soon a third temp came into the office. His job was different than ours but his desk faced us and so he watched us all day and our responses to customers. His name was Bart. One day Bart and I were in the Break room at the same time and he came up to me and asked a question. "I have been watching the two of you respond to angry customers on the phone. Why don't you act like the other guy does?" I told him it wasn't because I didn't want to, but that I was a believer in Jesus Christ and that affects how you live your life. You live differently. And then I explained why and how I had become a Christian. What an example this was of how we are being watched as Christians and what an opportunity this is to live out Christ in front of them. 
As Christians we are being watched by people who might need Christ and we have an opportunity to show them a different way. What will we show them by how we live?