Aristotle - The Organon - index for POSTERIOR ANALYTICS Book 1 Part 1

Proceeding from pre-existent knowledge

Paragraph 1 ALL instruction given or received by way of argument proceeds from pre-existent knowledge.

Paragraph 2 The pre-existent knowledge required is of two kinds.

Paragraph 3 If he did not in an unqualified sense of the term know the existence of this triangle, how could he know without qualification that its angles were equal to two right angles?

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Paragraph 1	ALL instruction given or received by way of argument proceeds from pre-existent knowledge.
Paragraph 2	The pre-existent knowledge required is of two kinds.
Paragraph 3	If he did not in an unqualified sense of the term know the existence of this triangle, how could he know without qualification that its angles were equal to two right angles?