That the thing signified transcends the sign, outreaches the figure, is no discovery; the thing figured always belongs to a higher stratum, to which the simile serves but as a ladder; when the climber has reached it, 'he then unto the ladder turns his back.' It is but according to the law of symbol, that the thing symbolized by the mirror should have properties far beyond those of leaded glass or polished metal, seeing it is a live soul understanding that which it takes into its deeps--holding it, and conscious of what it holds. It mirrors by its will to hold in its mirror. Unlike its symbol, it can hold not merely the outward visual resemblance, but the inward likeness of the person revealed by it; it is open to the influences of that which it embraces, and is capable of active co-operation with them: the mirror and the thing mirrored are of one origin and nature, and in closest relation to each other. Paul's idea is, that when we take into our understanding, our heart, our conscience, our being, the glory of God, namely Jesus Christ as he shows himself to our eyes, our hearts, our consciences, he works upon us, and will keep working, till we are changed to the very likeness we have thus mirrored in us; for with his likeness he comes himself, and dwells in us. He will work until the same likeness is wrought out and perfected in us, the image, namely, of the humanity of God, in which image we were made at first, but which could never be developed in us except by the indwelling of the perfect likeness. By the power of Christ thus received and at home in us, we are changed--the glory in him becoming glory in us, his glory changing us to glory.