Commentary On Aristotle'S De Anima

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To ascertain, however, anything reliable about it is one of the most difficult of undertakings. Such an enquiry being Common to many topicsI mean, an enquiry into the essence, and what each thing isit might seem to some that one definite procedure were available for all things of which we wished to know the essence; as there is demonstration for the accidental properties of things. So we should have to discover what is this one method. But if there is no one method for determining what an essence is, our enquiry becomes decidedly more difficult, and we shall have to find a procedure for each case in particular. If, on the other hand, it is clear that either demonstration, or division, or some such process is to be employed, there are still many queries and uncertainties to which answers must be found. For the principles in different subject matters are different, for instance in the case of numbers and surfaces.


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