What is light? Will some one tell me? The corpuscular theory, which the famous Newton advocated, is long since abandoned. The later wave theory is pretty generally accepted, and yet they can not all agree upon that. These people say that light is a part of the kind of energy called radiant energy. Now, we all know what light is! The sun of course is not light, only a light-holder and distributer. According to the oldest record we have of the creation, light existed before these light-holders, the sun and moon and stars. What is love? Well, you all _know_, I hope. Pity the poor man who does not know by experience what love is. But you cannot tell what it is. "Oh!" you say, "it is emotion." Yes, so is hate, its very opposite. "Well, love is affection." Yes. What is affection? "Well, it is a pleasurable feeling, or regard, which may be very intense, and which leads us to unlimited sacrifice if need be. It is a devotion that grips the soul tremendously." That is true; yet that is only telling what love is like. No simple, plain definition of love, or light or life has ever been formed yet by man so far as I can learn. What is power? You may say it is force. And what is force? "Well, force is a form of energy." What is energy? "Well," you reply, "it is a strong inward movement whose strength is very impressive." Some one says "power is ability." And ability? "Well, that is the innate power to do something." And so we get to use our word in the attempted definition itself, which is simply talking in a circle. We can find good descriptive words, but no defining words. Now mark a singular fact. In the writings of John, in this old book I have here, you will find a few statements regarding these things which combine wondrous simplicity of language with marvelous, yes, unfathomable, depth of meaning. First, about life: in chapter one, verse four, of the gospel:--"in Him was life," being an evident allusion to the remarkable Genesis statement: "the Lord God breathed into his nostrils the breath of life, and man became a living soul." Then, about love: in chapter four, verse seven, of his first epistle:--"love is of God"; coupled with the twice spoken words "God is love" in the same chapter. About light: in chapter one, verse five, of the same epistle, "God is light." I know some of you, perhaps some skilled theologian here, is saying to himself, "Those are statements of _moral_ truths." And I understand that that is the common conception. But I want to state here my own profound conviction, based on the Spirit-breathed words of John, that some day, when we shall know about all these deep things, we shall be finding that there is a basis not only of moral truth, but of far more than moral truth underlying those profoundly simple statements.