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CHAPTER FORTY FIVE

It is but by the diversity of impressions or of effects which substances or bodies make upon us, that we feel them, that we have perceptions and ideas of them, that we distinguish them one from another, that we assign to them peculiarities. Moreover, in order to perceive or to feel an object, this object must act upon our organs; this object can not act upon us without exciting some motion in us; it can not produce any motion in us if it is not itself in motion. As soon as I see an object, my eyes must be struck by it; I can not conceive of light and of vision without a motion in the luminous, extended, and colored body which communicates itself to my eye, or which acts upon my retina. As soon as I smell a body, my olfactory nerve must be irritated or put into motion by the parts exhaled from an odorous body. As soon as I hear a sound, the tympanum of my ear must be struck by the air put in motion by a sonorous body, which could not act if it was not moved of itself. From which it foll
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