Gassendi, Pierre, De motu impresso a motore translato epistulae duae, 1642

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              <s id="id.000599">XIX. </s>
              <s id="id.000600">Vnum addo; nempe licere ex iſtis in­
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              telligi, quid ſentiendum ſit de difficultate vulgò
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              excitata circa vim impreſſam projectintibus. </s>
              <s id="id.000601">Re­
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              quiritur quippe quid nam hæc vis ſit in re mobili?
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              </s>
              <s id="id.000602">quomodo in ea imprimatur? </s>
              <s id="id.000603">quomodo perduret?
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              </s>
              <s id="id.000604">quomodo euaneſcat? </s>
              <s id="id.000605">Enimverò, cùm haberi ſoleat
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              vt vis actiua lapidem mouens; videtur tamen vis
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              actiua, quæ projectionis cauſa eſt, eſſe in ipſo pro­
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              ijciente, non verò in projectare, quæ merè paſſiuè
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              ſe habet. </s>
              <s id="id.000606">Id, quod in re projecta eſt, motus eſt,
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              quil icet interdum nominetur vis, impetus, & c. (vt
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              etiam aliquoties à nobis factitatum eſt, dum, vt fa­
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              ciliùs intelligamur, familares voces, quantum poſ­
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              ſumus, retinemus) non proptereà tamen aliud quid­
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              piam eſt reipſâ, quàm ipſemet motus. </s>
              <s id="id.000607">Et ſanè vnus,
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              idemque motus, vel per Ariſtotelem, actio ſimùl,
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              & paſſio eſt; actio proüt eſt à mouente, paſſio, proüt
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              in mobili: quare vt in mouente eſt vis actiua, qua,
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              moueat; ita in mobili vis paſſiua, qua moueatur:
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              & dum mobile reipſâ mouetur, non in eo quærenda
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              eſt vis actiua, quæ in mouente ſolo neceſſaria fuit,
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              ſed paſſiua ſolùm, quæ in eo eſt, & redacta quidem,
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              vt vocant, ad actum. </s>
              <s id="id.000608">Neque obſtat, quòd mouens
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              ſeparatum ſit, aut interiiſſe etiam, conſtante motu
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              accepto, poſſit; nam non proptereà requiritur, vt
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              aliam, præter motum, vim à ſeipſo tranſmiſerit,
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              quæ motum deinceps efficiat; ſed ſufficit vt motum
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              ſemel in mobili fecerit, qui continuari abſque ip­
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              ſo poſſit. </s>
              <s id="id.000609">Poteſt autem; quoniam eſt eius naturæ
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              accidens, vt modò ſubjectum perſeuerans habeat, </s>
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