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If we look more attentively at all sciences and arts, what different metamorphoses, what wonderful play of nature, and what phenomena worthy of all admiration they place before our eyes! What has human industry not devised up to this point, so that it might provide for its own utility and the benefit of others? But since our mind is shrouded in fog, and as if wrapped in darkness, it requires spectacles that might assist and sharpen its gaze. It has sought for itself many paths and instruments, by which, once aided, it might obtain further insight with less trouble and on a firmer foundation. With these, nature, having been miserably torn apart, has produced from its inner bosom and shown us things that, hidden previously in deep darkness, were concealed from us. From this, its investigators have embraced the name of Philosophers, since they saw so much in their own work still to be attempted and scrutinized