So do not get into the habit of letting circumstances settle what you are to do, or you will lose the power of dominating them, before very long. And if a man for years leaves himself, as it were, to be guided by the stream of circumstances, like long green weeds in a river, he will lose the power of determining his own fate, and the Will will die clean out of him. Cultivate it, and it will grow. Again, this same principle largely settles our knowledge, our convictions, the operations and the furniture of our understandings. If a man holds any truth slackly, or in the case of truths that are meant to influence life and conduct, does not let it influence these, then that is a kind of having truth that is sure to end in losing it. If you want to lose your convictions grasp them loosely--do not act upon them, do not take them for guides of your life--and they will soon relieve you of their unwelcome presence. If you wish mind and knowledge to grow, grip with a grip of iron what you do know, and let it dominate you, as it ought. He that truly _has_ his learning will learn more and pile by slow degrees stone upon stone, until the building is complete. So, dear friends, here, in these illustrations, which might have been indefinitely enlarged, we see the working of a principle which has much to do in making men what they are. What you use you increase, what you leave unused you lose. There are grey heads in my present audience who, when they were young men, had dreams and aspirations that they bitterly smile at now. There are men here who began life with possibilities that have never blossomed or fruited, but have died on the stem. Why? Because they were so much occupied with the vulpine craft of making their position and their 'pile' that generous emotions and noble sympathies and lofty aspirations, intellectual or otherwise, were all neglected, and so they are dead; and the men are the poorer incalculably, because of what has thus been shed away from them. You make your characters by the parts of yourselves that you choose to cultivate and employ. Do you think that God gave us whatever of an intellectual and emotional and moral kind is in us, in order that it might be all used up in our daily business? A very much scantier outfit would have done for all that is wanted for that. But there are abortive and dormant organs in your spiritual nature, as there are in the corporeal, which tell you what you were meant for, and which it is your sin to leave undeveloped. Brethren, the law of my text shapes us in the two ways, that whatever we cultivate, be it noble or be it bestial, will grow, and whatever we repress or neglect will die. Choose which of the two halves of yourselves you will foster, and on which you will frown. So much, then, for the first general application of these words. Now let me turn for a moment to another. II. I would note, secondly, the application of this two-fold law in regard to God's revelation of Himself.