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Rh sometimes a falsehood and must always be a fallacy.

"In the only true sense of the word power," says Mr. Shelley, "it applies with equal force to the loadstone, as to the human will! Do you think these motives, which I shall present, are powerful enough to rouse him? is a question as common as, Do you think this lever has the power of raising this weight?" This is true; but the answers are not so certain of being similar. We can tell when the lever is powerful enough to raise the weight; but we may in vain endeavour to ascertain the motives that are strong enough to rouse the mind. The difference is, that the weight is passive to the power, and is necessitated to obey its influence. It is the active and determining principle; but the mind bears no similitude to the weight. It may refuse to be acted upon by any motive—the motives we imagine sufficiently powerful to rouse it, may be disregarded; and the motives have not the power of the lever, to enforce the necessity of action. The reason is plain. The mind thinks for itself—the weight obeys the superior impulse of the lever. There is no analogy between them:—and the argument fails from the want of a just degree of comparison.