And this light is twofold; it is a light of warning, and it is a light of holy example.--A light of warning. If you look at a great railway station at night, you will see numbers of lamps, some showing a red, some a green, some a white light. These are all warnings to the many trains leaving or entering the station, and upon them depends the safety of hundreds of lives. If the signal man fails to show the red light when there is danger, wholesale destruction follows. Dear hearers, there are times when we are called upon to show the danger signal. If we see a relative or friend deliberately going into danger, taking a course which means ruin to his character, ruin to his soul, what is our duty? Are we to say, I am very sorry, and thus hide our light under a bushel? No, we must try to stop a brother from destruction; we must say a word of warning, kindly, tactfully, but firmly; we must say, For God's sake, stop! If you see an acquaintance imbibing too freely, frequenting the place at the corner, show him the danger, hang out the red light. If you see young people neglecting religious duties, slinking about after dark in bad company, going with those who bet and gamble,--let them go? No; try to turn them on a safe road; hang out the red light, the danger signal. I once read of a man who was engaged as a laborer on a railway. One stormy night, when he returned to his cabin, he found that a sudden landslide had occurred, and that part of the track was blocked where the express would pass in a few moments. Would he remain quiet and let the accident happen? What could he do to show the danger signal? He had in his cabin an old lantern lighted by a piece of candle, but that would not show the red light. Then, when the roar of the advancing train was audible in the distance, he seized a glass flask and with the broken neck cut into the veins of his wrist he let the blood color the lantern, and the candle shone through it with a dim red light, and this, scarcely able to stand, he held up on high, just in time to stop the express at the edge of destruction. Take that illustration for what it is worth, just so it impresses you with the importance of showing the red danger signal unto others.