You are like light for the whole world.  A city built on a hill cannot be hid.  No one lights a lamp and puts it under a  bowl; instead it is put on the lampstand, where it gives light for everyone in the house.  In the same way your light must shine before people, so that they will see the good things you do and praise your Father in heaven. 
                                                                                 Matthew 5: 14-16