IV. We cannot too earnestly inculcate upon the youthful inquirer the necessity of thus looking at _revelation as a whole_. Strong as are the evidences for the truth of the gospel narratives considered separately, they gain new strength, on the one side, from the mighty revelations that preceded them and prepared the way for the advent of the Son of God; and on the other, from the mighty events that followed his advent in the apostolic age, and have been following ever since in the history of the Christian church. The divine origin of the Mosaic institutions can be shown on solid grounds, independently of the New Testament; but on how much broader and deeper a foundation are they seen to rest, when we find (as will be shown hereafter, chap. 8) that they were preparatory to the incarnation of Jesus Christ. As in a burning mass, the heat and flame of each separate piece of fuel are increased by the surrounding fire, so in the plan of redemption, each separate revelation receives new light and glory from the revelations which precede and follow it. It is only when we view the revelations of the Bible as thus progressing "from glory to glory," that we can estimate aright the proofs of their divine origin. If it were even possible to impose upon men as miraculous a particular event, as, for example, the giving of the Mosaic law on Sinai, or the stones of the day of Pentecost, the idea that there could have been imposed on the world a series of such events, extending through many ages, and yet so connected together as to constitute a harmonious and consistent whole, is a simple absurdity. There is no explanation of the unity that pervades the supernatural facts of revelation, but that of their divine origin.