Projectors may have beautiful specifications with attractive pictures of their new inventions; they look very well upon paper, but we must see them working before we are sure of their worth. And so, here is this great body of Divine truth, which assumes to be sufficient for guidance, for conduct, for comfort, for life. Live upon it, and thereby your grasp of it and your confidence in it will be immensely increased. And no man has a right to say 'I have rejected Christianity as untrue,' unless he has put it to the test by living upon it; and if he has, he will never say it. A Swiss traveller goes into a shop and buys a brand-new alpenstock. Does he lean upon it with as much confidence as another man does, who has one with the names of all the mountains that it has helped him up branded on it from top to bottom? Take _this_ staff and lean on it. Live your creed, and you will believe your creed as you never will until you do. Obedience takes a man up to an elevation from which he sees further into the deep harmonies of truth. In all regions of life the principle holds good: 'To him that hath shall be given.' And it holds eminently in reference to our grasp of Christian principles. Use them and they grow; neglect them and they perish. Sometimes a man dies in a workhouse who has a store of guineas and notes wrapped up in rags somewhere about him; and so they have been of no use to him. If you want your capital to increase, trade with it. As the Lord said when He gave the servants their talents: 'Trade with them till I come.' The creed that is utilised is the creed that grows. And that is why so many of you Christian people have so little real intellectual grasp of the principles of Christianity, because you have not lived upon them, nor tried to do it. And, in like manner, another side of this thought is, be true to your convictions. There is no such barrier to a larger and wholesomer view of our duty as the neglect of anything that plainly is our duty. It stands there, an impassable cliff between us and all progress. Let us live and be what we know we ought to be, and we shall know better what we ought to be at the next moment. II. Secondly, let me put the Apostle's meaning in another exhortation, Go on as you have begun.