Light serves a purpose as well. And this was a picture that these fisherman would understand. A Light Attracts Peter and Andrew and the boys fished at night because during the day the fish in the Sea of Galilee stay close to the bottom where it’s cooler but during the cool of the night they come close to the surface and the guys would have kept a lit torch aboard their boats to draw the fish even closer. You ever turn your lights off on your porch in the summer time because it attracts moths. 10 Years ago when we first moved into Kingswood our son Stephen had fallen asleep watching TV and had the outside light on and the front room light on and someone who was lost deep in the Bowels of Kingswood came to our door at 2:30 in the morning looking for directions, why? Because they saw our light. When we are the light of the world we will attract people to Jesus, that’s part of what we are supposed to do. Remember what Jesus told his disciples in Matthew 4:19 Jesus called out to them, “Come, follow me, and I will show you how to fish for people!” and Paul writes in Ephesians 5:8 For once you were full of darkness, but now you have light from the Lord. So live as people of light!
From Denn Guptill’s Sermon: Salt and Light Are?