Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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neceſſity ſuſpect our own ſenſes, as wholly fallible, or ſtupid in
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judging of ſenſible things even very near at hand. </
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<
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>What truth
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therefore can we hope for, to be derived from ſo deceiveable a
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culty?</
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<
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>SALV. </
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>But I deſire not to deduce precepts more profitable, or
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more certain, learning to be more circumſpect and leſs confident
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about that which at firſt bluſh is repreſented to us by the ſenſes,
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which may eaſily deceive us. </
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<
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>And I would not have this Author
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trouble himſelf in attemptiug to make us comprehend by ſenſe,
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that this motion of deſcending Graves is ſimply right, and of
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no other kind; nor let him exclaim that a thing ſo clear, manifeſt,
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and obvious ſhould be brought in queſtion; for in ſo doing, he
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maketh others believe, that he thinketh thoſe that deny that
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tion to be abſolutely ſtreight, but rather circular, the ſtone did
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ſenſibly ſee it to move in an arch, ſeeing that he inviteth their ſenſes
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more than their Reaſon, to judg of that effect: which is not true,
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Simplicius,
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for like as I, that am indifferent in all theſe
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ons, and onely in the manner of a Comedian, perſonate
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cus
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in theſe our repreſentations, have never ſeen, nor thought
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that I have ſeen that ſtone fall otherwiſe than perpendicularly,
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ſo I believe, that to the eyes of all others it ſeemed to do the
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ſame. </
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<
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>Better it is therefore, that depoſing that appearance in
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which all agree, we make uſe of our Reaſon, either to confirm the
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reality of that, or to diſcover its fallacy.</
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<
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>SAGR. </
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>If I could any time meet with this Philoſopher, who
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yet me thinks is more ſublime than the reſt of the followers of
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the ſame doctrines, I would in token of my affection put him in
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mind of an accident which he hath doubtleſs very often beheld;
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from which, with great conformity to that which we now diſcourſe
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of, it may be collected how eaſily one may be deceived by the bare
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appearance, or, if you will, repreſentation of the ſenſe. </
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<
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>And the
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accident is, the Moons ſeeming to follow thoſe that walk the ſtreets
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in the night, with a pace equal to theirs, whilſt they ſee it go
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ding along the Roofs of houſes, upon which it ſheweth juſt like a
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cat, that really running along the ridges of houſes, leaveth them
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behind. </
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<
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>An appearance that, did not reaſon interpoſe, would but
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too manifeſtly delude the ſight.</
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<
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>SIMP. </
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>Indeed there want not experiments that render us
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tain of the fallacy of the meer ſenſes; therefore ſuſpending ſuch
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ſenſations for the preſent, let us hear the Arguments that follow
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which are taken, as he ſaith,
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ex rerum naturâ.
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The firſt of which
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is, that the Earth cannot of its own nature move with three
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ons very different; or otherwiſe we muſt deny many manifeſt
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Axioms. </
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<
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>The firſt whereof is, that
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Omnïs effectus dependeat ab
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aliquâ cauſâ; [i. </
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>e.]
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that every effect dependeth on ſome cauſe. </
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