The truth that Christ is the Son of God, who has died for our salvation, is the heart of the Gospel. And why should we make our faith in that, and our living by it, contingent on the clearing up of certain external and secondary questions; chronological, historical, critical, philological, scientific, and the like? And why should men be so occupied in jangling about the latter as that the towering supremacy, the absolute independence, of the former should be lost sight of? What would you think of a man in a fire who, when they brought the fire-escape to him, said, 'I decline to trust myself to it, until you first of all explain to me the principles of its construction; and, secondly, tell me all about who made it; and, thirdly, inform me where all the materials of which it is made came from?' But that is very much what a number of people are doing to-day in reference to 'the Gospel of our salvation,' when they demand that the small questions--on which the central verity does not at all depend--shall be answered and settled before they cast themselves upon that. Another of the blunders of these disciples, in which they show themselves as our brethren, is that they fling up the attempt to apprehend the obscurity in a very swift despair. 'We cannot tell what He saith, and we are not going to try any more. It is all cloud-land and chaos together.' Intellectual indolence, spiritual carelessness, deal thus with outstanding difficulties, abandoning precipitately the attempt to grasp them or that which lies behind them. And yet although there are no gratuitous obscurities in Christ's teaching, He said a great many things which could not possibly be understood at the time, in order that the disciples might stretch up towards what was above them, and, by stretching up, might grow. I do not think that it is good to break down the children's bread too small. A wise teacher will now and then blend with the utmost simplicity something that is just a little in advance of the capacity of the listener, and so encourage a little hand to stretch itself out, and the arm to grow because it is stretched. If there are no difficulties there is no effort, and if there is no effort there is no growth. Difficulties are there in order that we may grapple with them, and truth is sometimes hidden in a well in order that we may have the blessing of the search, and that the truth found after the search may be more precious. The tropics, with their easy, luxuriant growth, where the footfall turns up the warm soil, grow languid men, and our less smiling latitude grows strenuous ones. Thank God that everything is not easy, even in that which is meant for the revelation of all truth to all men! Instead of turning tail at the first fence, let us learn that it will do us good to climb, and that the fence is there in order to draw forth our effort.