Christianity is a light in this world because of the greatness of its power and the excellence of its purity. John, who is denominated the forerunner of Jesus, or the heralding star of Christianity, said that “he was not that Light, but was sent to bear witness of that Light. That was the true Light, which lighteth every man that cometh into the world.” John 1:8, 9. Of whom speaketh the prophet then? The Son of God will answer this question in these words: “I am the light of the world: he that followeth me shall not walk in darkness, but shall have the light of life.” John 8:12. Jesus was the light of the world because of his power and purity. All power was given unto him in heaven and in earth. Mat. 28:18. He was holy, harmless and undefiled. Heb. 7:26. The Lord Jesus lived a pure and holy life. “He did no sin, neither was guile found in his mouth.” He had power to open the blind eyes, to unstop the deaf ears, to loose the dumb tongue, to make the lame man leap as a hart, and to heal all manner of diseases, and to raise the dead. There is no sin in heaven; there is no sickness there. He brought the light of heaven to this world in displaying his power over sin and disease. Glory to his name! We wish to impress this fact upon the reader’s mind that he was a light because of his purity and power, and because he was the “Truth.” And now if you will but believe it, that is the true light of Christianity. The Lord Jesus was only a visitant. His stay on earth was transient. He came from heaven, and heaven soon again received him. Referring to his departure he said to his disciples: “Yet a little while is the light with you. Walk while ye have the light; ... while ye have light, believe in the light, that ye may be the children of light.” John 12:35, 36. Again he says, “As long as I am in the world, I am the light of the world.” John 9:5. We learn the sad story of his crucifixion, then the glad news of his resurrection, and then his ascension in a cloud to the glory, from whence he came. Is the light of Christianity gone from the world? Is this world left again in darkness? No; thank God! Jesus now says to his devoted followers: “Ye are the light of the world. A city that is set on a hill can not be hid.” Mat. 5:14. It is the “city of Zion, the perfection of beauty,” out of which God doth shine. “The glory of God is risen upon her.” Jesus told them to believe in the light while they had the light, that they might be the children of light. Paul, in exhorting Christians to a holy life, said: “That ye may be blameless and harmless, the sons of God, without rebuke, in the midst of a crooked and perverse nation, among whom ye shine as lights in the world.” Phil. 2:15. “For ye were sometimes darkness, but now are ye light in the Lord: walk as children of light.” Eph. 5:8. “Ye are all the children of light, and the children of the day: we are not of the night, nor of darkness.” 1 Thes. 5:5.