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This is true, as we all know, of the muscular system, voluntary and involuntary. In breathing, in winking of the eyes, in the beating of the heart, there is a system of alternate action and repose, each brief indeed in their existence, but indispensable to the healthy action of the muscles, and to the continuance of life. Each one of these organs, too, though they seem to be constantly in motion, will have the rest which nature demands, or disease and death will be the result. The same is true of our voluntary muscles. He that should endeavour to labour at the same thing constantly, he that should attempt to run or walk without relaxation, he that should exercise the same class of muscles in writing, in the practice of music, in climbing, or in holding the limb in a fixed position, would soon be sensible that he was violating a law of nature, and would be compelled by a fearful penalty to pay the forfeit. Nay, in doing these very things, in running, or leaping, or climbing, or in the most rapid execution of a piece of music, nature has provided by antagonist muscles that the great law demanding repose shall not be disregarded. A long-continued and uninterrupted tension of any one of the muscles of the frame would soon bring us into conflict with one of the universal laws of our being; and we should be reminded of the existence of those laws in such a way that we should feel that they must be observed. Yet the operation of this law of our nature is not enough. We need other modes of rest than those which can be obtained by the intermitted action of a muscle which is soon to be resumed. We need longer repose; we need an entire relaxation of the system; we need such a condition that every muscle and nerve shall be laid down, shall be relaxed, shall be composed to rest, and shall be left in an undisturbed position for hours together, where there shall be no danger of its being summoned into action. Nature has provided for this too, and this law must be obeyed: for a few hours only can we be employed on our farms, or in our merchandise, and then the sun refuses us light any longer, and night spreads her sable curtains over all things, and the affairs of a busy world come to a pause. Darkness broods on the path of man, comes into his counting house and his dwelling, meets him in his travels, interrupts his busiest employments, wraps the world in silence; and he himself sympathizes with the universal stillness of nature, and sinks down into a state of unconsciousness. The heart continues, indeed, still to beat, but more gently than under the excitements of political strife, of avarice and revenge; the lungs heave, though more gently than in the hurry and excitement of the chase, or in the anxious effort for gold. But the eyelid heavy will not suffer the eye to look out on the world, and even its involuntary action entirely ceases, and it sinks to repose. The ear, as if tired of hearing so many jarring and discordant sounds, hears nothing; the eye, as if wearied with seeing, sees nothing; the agitated bosom is as calm as it was in the slumberings of infancy: the stretched and weary muscle is relaxed, the nerve is released from its office of conveying the intimations of the will to the distant members of the exhausted frame. The storm may howl without, or the ocean roll high its billows, or perhaps even the thunder of battle may be near, but nature will have repose. Napoleon, at Leipsic, exhausted by fatigue, reposed at the foot of a tree even when the destiny of his empire depended on the issue of the battle; and not even the roaring storm at sea can prevent compliance with this necessary law.

(A. Barnes, D. D.)The mighty mind and the vigorous frame of Napoleon once enabled him to pass four days and nights in the exciting scenes of an active campaign without sleep, and then he fell asleep on his horse. The keenest torture which man has ever invented has been a device to drive sleep from the eyes, and to fix the body in such a position that it cannot find repose; and even this must fail, for the sufferer will find repose on the rack or in death. The same law, demanding rest, exists also in relation to the mind, and is as imperious in regard to the intellectual and moral powers, in order to their permanent and healthful action, as to the muscles of the body. No man can long pursue an intellectual effort without repose. He who attempts to hold his mind long to one train of close thinking, he who pursues far an abstruse proposition, and he who is wrought up into a high state of excitement, must have relaxation and repose. If he does not yield to this law, his mind is unstrung, the mental faculties are thrown from their balance, and the frenzied powers, perhaps yet mighty, move with tremendous but irregular force, like an engine without balance wheel or "governor," and the man of high intellectual rowers, like Lear, becomes a raving maniac. So with our moral feelings. The intensest zeal will not always be on fire, the keenest sorrow will find intermission, and even love does not always glow with the same ardour in the soul. This law, contemplating our welfare, cannot be violated without incurring a fearful penalty.

(A. Barnes, D. D.)

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KJV: And he said unto them, The sabbath was made for man, and not man for the sabbath:

WEB: He said to them, "The Sabbath was made for man, not man for the Sabbath.