"You are the light of the world. A city set on a hill cannot be hidden." -Matthew 5:14
Whether you like it or not, you are an example. People are always watching you, and it is your responsibility that you lead the life of a good example. As Christians, it is important that we show people who we serve on a daily basis, and it doesn't matter who you're around. Not only is it important for us to follow God's commandments, but to help make sure that others do as well, and how can we do that if we're not even following what we teach? "Or how can you say to your brother, 'Let me take the speck out of your eye,' when there is a log in your own eye? You hypocrite, first take the log out of your own eye, and then you will see clearly to take the speck out of your brother's eye." We need to remember that we aren't perfect, but we need to make sure that we're not going against not only God's teachings, but our teachings as well, which should be the same.
As Christians, we not only need to be good in public, but in private as well. I mean, how can we teach others to do God's will, if we don't even do it unless people are watching us? If we are going to be good examples, then we have to be good examples when we're in public, as well as when we're alone, because it will show how you are in private when you're out in public. You may not realize it, but it's true.
Today I would like to encourage you to always remember who is watching, and use that as motivation to follow God's will more, and become a more faithful Christian every day.