I read that verse and thought, WOW - there is a lot there!!! Those people who claim to be born again Christians are God's light on this earth... But so many are of them are not shining like the light they should be. They turned off the light switch a long time ago and now are walking around just as the rest of the world - in darkness.
If you want your light to shine, you have to love the Lord and hunger after Him. You have to give be willing to give of yourself to others, and truly care about the things that God cares about.
When you make this kind of impact... It brings people back to what you're trying to bring them to - the Lord. Some of you think, "Well, I help my friends, family, and other Christians." That's good, it really is... BUT it's not good enough. You need to be a light to those who don't believe too, and to those who aren't right with God. You need to be a light to those who have no light in their lives. What good is a flashlight in broad daylight? It's of no use, it's only of use at night, or in a dark room.
It's good to treat the people you know nicely, but you also need to go out of your way and give those you don't know that light of hope. I have seen too many people just judge others, and condemn others, and they don't help them because they say, "That person's not right with God, I'm not helping them!" I have to say it... THAT IS THE MOST STUPID THING I'VE EVER HEARD ANYONE SAY! If they're not right with God, then it's YOUR job to help them! That is more reason to help them, not less!
Jesus healed the sick, both believers and unbelievers... The unbelievers came to Him after He helped them. It didn't just save their bodies, it saved their souls. He did so many things, for so many different people. So many Christians are in a horrible spot today. The reason we're not getting anything done, the reason they aren't growing in the Lord , or seeing revival in their own heart is because they are too busy judging others, and condemning others... They even judge and condemn each other! If you're one of these people, you need to put your pride aside and let the light God gave you shine. This isn't even about your pride, this is about helping you help yourself, so you can help others. I'm not too prideful to beg this favor of you, so please don't be too prideful to listen.
Matthew 5:14 Ye are the light of the world. A city that is set on an hill cannot be hid.
Acts 13:47 For so hath the Lord commanded us, saying, I have set thee to be a light of the Gentiles, that thou shouldest be for salvation unto the ends of the earth.