Have you ever seen, when the moon has been shining over the sea, making a long, broad pathway of brightness, a ship, as it sails along, suddenly come into that bright track? It is a beautiful sight; just for one moment every mast and sail all stand out with such distinctness that you say, "Oh, I can see her now perfectly!" Then, while you look, she has crossed the shining path, and you can but just trace her dim outline, and know that a ship is sailing there. [Illustration: CROSSING THE SHINING PATH.] When the Lord Jesus Christ was in this world He said, "As long as I am in the world, I am the light of the world." He showed people plainly that He knew them in a way that no one else could. Some people were glad; one poor woman, who had been in the dark all her life, went and told everyone about Him, and said, "Come, see a man, which told me all things that ever I did." Others could not bear that that light should show them to themselves, so we read that one day those who had been with Him, "went but one by one," until they were all gone. Which would you rather be like--the people who went away into the darkness, rather than be found out by the Light, or the one who stayed, and heard those words she could never forget--"Neither do I condemn thee; go and sin no more"? The only way not to be afraid of the light is to come to the Lord Jesus Christ, who has said of every one that follows Him, that he shall not "abide in darkness, but shall have the light of life." But hiding--hiding from God--only means getting deeper into the dark, farther away from Him who is Light. Now that we have spoken of these solemn and important things--things which I like to speak to you about, but which God alone, who loves you so much, can really teach you:--I should like to tell you a little about the light as we see it all around us. Now, what can we learn about it? First, we learn that it was called into existence by the voice of God. God said, "Let there be light; and there was light" on the FIRST DAY, but it was not until the FOURTH DAY that those great light-bearers--the sun and the moon--were made lights to the earth, and set "for signs, and for seasons, and for days and years." But the question, "What is light?" is not one easily answered. We can all understand that light is that which makes everything visible, but you will perhaps be surprised to hear that it has taken a very long time even to find out how the light comes to us. It is now generally believed that light, which is one of the strongest powers in the world, is caused by motion; and that it is because every light-giving body is always moving very fast, that it gives out light. But no one can explain how this rapid movement began, nor what that "ether" is through which the "vibrations" travel until they reach a wonderful little screen which we have at the back of each of our eyes, by means of which we are able to see.