You speak of a seventy-two-hour exercise in thankful positive thinking. It is well to set the mind upon gratitude, but beware lest you imagine this is a feat of your own strength, a discipline of the will by which you manufacture a thankful heart. Our danger is ever present. We are in danger of falling, not only some of us, but all of us! Many a time you have expressed your gratitude to a friend when he has said, "I will do so-and-so for you." You were sure that he would do what he said, his promise was enough for you! How much more then, when we consider the promise of the immutable God. True thankfulness does not rise from a forced cheerfulness, but from tasting the positive feast of mercy which is set before us in the Gospel.
Look well to the ground of your gratitude. This cannot mean a transient draught that would slake the thirst for an hour or two, it must imply such a partaking as changes a man's actual constitution and his destiny, and become in him a never-failing wellspring. If the grace of God has really changed you, you are radically and lastingly changed. The right foundation for thankfulness is not a fleeting frame of mind to be sustained for a set number of hours, but the settled assurance that He who began a good work in you will perform it until the day of Christ. Faith in the everlasting covenant stirs my heart's blood, fills me with grateful joy, inspires me with confidence, fires me with enthusiasm. There thou art, at this hour, like the bird-catcher of ###, thou art being drawn to heaven by a single rope; if that hand which holds thee let thee go, if that rope which grasps thee do but break, thou art dashed on the rocks of damnation. Yet the grip is sure. That truth breeds a thankfulness which cannot be contained by a clock.
Yet take heed. This is a caution: for there is a man behind the wall who is pouring oil on the fire; and we have cause for gratitude in the fact, that if the oil were not put in by a heavenly hand, we should inevitably be driven to destruction. Your exercise must not be a mere looking into the almanac to find lucky days; this instead of faith in the Most High. A professor of religion may attempt to conjure up thankfulness from the empty well of his own nature, but the result is a thankfulness not worth more than what they pay to express it: that is to say, nothing at all. The saint’s gratitude is a tangible thing. Did she not say to herself, "The Lord has served me; I will serve Him"? It never strikes an awakened person that mere words are a fit return for the Grace of God. If you would have your hours filled with thankful positive thinking, let them be filled with ministering to Christ by serving His children. Let your gratitude take hands and feet.
The righteous shall hold on his way, and he that hath clean hands shall wax stronger and stronger. Your desire for a sustained season of thankfulness hints at a deeper thirst. When Christ gave the word, her daughter was made whole from that very hour. He speedily finished that work. He can as readily give you the spirit of perpetual praise. Only let the object of your thankfulness be the sovereign grace which secures your soul, and the channel of it be practical love. We have, therefore, cause for great watchfulness, deep humility, but also for much thankfulness that we are placed where the tempters cannot reach us, for the promise assures us that none is able to pluck us out of Christ's hand!