A city set on a mountain cannot be hidden.
Nor do they light a lamp and then put it under a bushel basket;
it is set on a lampstand,
where it gives light to all in the house.
Just so, your light must shine before others,
that they may see your good deeds
and glorify your heavenly Father.
When Jesus commanded his followers to be the lights of the world, he demanded nothing less than that they should be like himself.
When Jesus spoke these words, he was using an expression which was quite familiar to the Jews who heard it for the first time. They themselves spoke of Jerusalem as "a light to the Gentiles," and a famous Rabbi was often called "a lamp of Israel." But the way in which the Jews used this expression will give us a key to the way in which Jesus also used it.
Of one thing the Jews were very sure--no man kindled his own light. Jerusalem was indeed a light to the Gentiles, but "God lit Israel's lamp." The light with which the nation or the man of God shone was a borrowed light. It must the so with the Christian. It is not the demand of Jesus that we should, as it were. produce our own light. We must shine with the reflection of his light. The radiance which shines from the Christian comes from the presence of Christ within the Christian's heart. We often speak about a radiant bride, but the radiance which shines from her comes from the love which has been born within her heart.