14 You are the light of the world. It is not possible for a city situated on the top of a mountain to be hidden.
15 Neither do they light a lamp and put it under a basket, but put it on a lampstand so that it gives light to everyone in the house.
Once again this is a familiar saying that comes from the lips of Jesus.
Living and walking in darkness is not natural. The human race is not nocturnal; we have been created to be awake and to live and work during the hours of daylight. The majority of people do their work whilst it is daylight. Obviously there are those who do work during the night time and during the hours of darkness.
Having worked night shifts I can state that working through the night is not natural, just as it is not natural to sleep during the day time.
God created us to be people who come alive during the light of the day.
We might be thankful that artificial lighting has extended the shorter days to enable us to have a longer working day. Sporting events can take place under floodlights, and our homes and streets are places where lights dispels darkness.
When Jesus spoke these words He was inferring that the world is a dark place. There is the darkness of sin, and the darkness of the devil. The world is totally incapable of producing light. It has no power stations with which it can produce the light that leads people to salvation.
On other occasions Jesus said that He is the Light of the world, and because He is the Light of the world so are His followers.
Everyone who is born again has within them the Light of Jesus, and just as the Light of Jesus never diminishes, neither must the light of Jesus within us.
Paul wrote to the Philippians and said:
 In everything you do, stay away from complaining and arguing,
 so that no one can speak a word of blame against you. You are to live clean, innocent lives as children of God in a dark world full of crooked and perverse people. Let your lives shine brightly before them – Philippians 2.14-15 (NLT).