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Rest is the restorer of lost power. Motion is the result of force exerted upon matter, and so long as the force continues to be applied and there are no impediments, the motion will continue. But to the motion of terrestrial bodies impediments always exist, and however much the motion may be stimulated by the renewed application of force, it will be retarded, and will ultimately cease. As an illustration, let us consider an engine run by water power, steam or electricity. As long as the power is applied, the engine runs, for a while, smoothly and with ease. Soon interruptions occur; there is a jar, and a hitch in the action. If this is not looked into and remedied, the machinery begins to run irregularly and something gives way. It either stops altogether, or its action becomes inefficient and the product of its labor useless. One of the most
ULRICH CF. REST. JAMA. 1897;XXIX(15):724–727. doi:10.1001/jama.1897.02440410012002c
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