How often it is that you do not find physical energy indicative of spiritual power! If a clear head is worth more than one dizzy with perpetual vertigo--if muscles with the play of health in them are worth more than those drawn up in chronic "rheumatics"--if an eye quick to catch passing objects is better than one with vision dim and uncertain--then God will require of us efficiency just in proportion to what he has given us. Physical energy ought to be a type of moral power. We ought to have as good digestion of truth as we have capacity to assimilate food. Our spiritual hearing ought to be as good as our physical hearing. Our spiritual taste ought to be as clear as our tongue. Samsons in body, we ought to be giants in moral power. But while you find a great many men who realize that they ought to use their money aright, and use their intelligence aright, how few men you find aware of the fact that they ought to use their physical organism aright! With every thump of the heart there is something saying, "Work! work!" and, lest we should complain that we have no tools to work with, God gives us our hands and feet, with every knuckle, and with every joint, and with every muscle saying to us, "Lay hold and do something." But how often it is that men with physical strength do not serve Christ! They are like a ship full manned and full rigged, capable of vast tonnage, able to endure all stress of weather, yet swinging idly at the docks, when these men ought to be crossing and recrossing the great ocean of human suffering and sin with God's supplies of mercy. How often it is that physical strength is used in doing positive damage, or in luxurious ease, when, with sleeves rolled up and bronzed bosom, fearless of the shafts of opposition, it ought to be laying hold with all its might, and tugging away to lift up this sunken wreck of a world. It is a most shameful fact that much of the business of the Church and of the world must be done by those comparatively invalid. Richard Baxter, by reason of his diseases, all his days sitting in the door of the tomb, yet writing more than a hundred volumes, and sending out an influence for God that will endure as long as the "Saints' Everlasting Rest." Edward Payson, never knowing a well day, yet how he preached, and how he wrote, helping thousands of dying souls like himself to swim in a sea of glory! And Robert M'Cheyne, a walking skeleton, yet you know what he did in Dundee, and how he shook Scotland with zeal for God. Philip Doddridge, advised by his friends, because of his illness, not to enter the ministry, yet you know what he did for the "rise and progress of religion" in the Church and in the world.