Aristotle - The Organon - index for ANALYTICA POSTERIORA Book 2 Part 7

How then by definition shall we prove essential nature?

Paragraph 1 How then by definition shall we prove substance or essential nature?
Paragraph 2 To put it another way:
Paragraph 3 Moreover it is clear, if we consider the methods of defining actually in use, that definition does not prove that the thing defined exists:
Paragraph 4 Since, therefore, to define is to prove either a thing's essential nature or the meaning of its name, we may conclude that definition, if it in no sense proves essential nature, is a set of words signifying precisely what a name signifies.

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