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| (21) Et si quis hec duo principia vel alterum ipsorum negaret, ad ipsum non esset determinatio, cum contra negantem principia alicuius scientie non sit disputandum in illa scientia, ut patet ex primo Physicorum; sunt etenim hec principia inventa sensu et inductione, quorum est talia invenire, ut patet ex primo Ad Nicomacum. | (21) And if any one were to deny these two principles, or either of them, our proof would not appeal to him, since, if any one denies the principles of any science, there can be no discussion with him in that science, as is shown in the first Physicorum. For these principles are discovered by the senses and by induction, whose province it is to discover such, as is clear from the first ad Nichomachum. |