Not far from our home there is a satellite tower. Warning lights blink at the top of these towers to warn passing airplanes. The lights shine day and night. We spoke to the fellow who owns the land below these towers. He explained that if a light fails to blink an alarm is sounded. If one of those blinking lights stop blinking this fellow has to run out to the tower, climb the tower and replace a bulb. He is on call day and night. If he doesn't fix the light an aircraft could run into the tower.
Christians should shine the light of Christ Jesus from them day and night. We need to keep a vigil watch over the light within us. There is a lot at stake when His light fails to shine from within us. People who do not see the light of Christ in our lives are in danger of an eternity in hell.
You are the light of the world. A city that is set on a hill cannot be hidden. Nor do they light a lamp and put it under a basket, but on a lampstand, and it gives light to all who are in the house. Let your light so shine before men, that they may see your good works and glorify your Father in heaven. Matthew 5:4-16 (NKJV)
Satan wants to snuff out your light. Guard the light Christ has put within you.
Therefore take up the whole armor of God, that you may be able to withstand in the evil day, and having done all, to stand. Stand therefore, having girded your waist with truth, having put on the breastplate of righteousness, and having shod your feet with the preparation of the gospel of peace; above all, taking the shield of faith with which you will be able to quench all the fiery darts of the wicked one. And take the helmet of salvation, and the sword of the Spirit, which is the word of God; praying always with all prayer and supplication in the Spirit, being watchful to this end with all perseverance and supplication for all the saints Eph 6:13-18 (NKJV)
Is your light shining for the world to see? Time is short. If you have a bulb that is about to burn out, climb back into the Word of God and relight with God's plan for your life.