The words of Jesus from what is known as The Sermon on the Mount — Matthew 5:14-16 (NIV) From Bible Gateway
14 “You are the light of the world. A town built on a hill cannot be hidden.15 Neither do people light a lamp and put it under a bowl. Instead they put it on its stand, and it gives light to everyone in the house. 16 In the same way, let your light shine before others, that they may see your good deeds and glorify your Father in heaven.