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According to one traditional scheme, there are two "ways," or a "twofold way" (= duplex via) along which scientific activity proceeds: 

            1.  There is the via inventionis (= way of invention or discovery), which proceeds from how things seem to be, from the prius quoad nos to the prius quoad se.

            2.  There is the via disciplinae (=  way of the discipline or exposition and confession), which proceeds from how things are in themselves, from the prius quoad se, to the prius quoad nos.

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