Aristotle - The Organon - index for ANALYTICA POSTERIORA Book 1 Part 2

Unqualified scientific knowledge

Paragraph 1 We suppose ourselves to possess unqualified scientific knowledge of a thing, as opposed to knowing it in the accidental way in which the sophist knows, when we think that we know the cause on which the fact depends, as the cause of that fact and of no other, and, further, that the fact could not be other than it is.
Paragraph 2 There may be another manner of knowing as well - that will be discussed later.
Paragraph 3 Now since the required ground of our knowledge - i.e. of our conviction - of a fact is the possession of such a syllogism as we call demonstration, and the ground of the syllogism is the facts constituting its premisses, we must not only know the primary premisses - some if not all of them - beforehand, but know them better than the conclusion:

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