Aristotle - The Organon - index for ANALYTICA POSTERIORA Book 2 Part 11

We have scientific knowledge when we know the cause

Paragraph 1 We think we have scientific knowledge when we know the cause, and there are four causes:
Paragraph 2 The same thing may exist for an end and be necessitated as well.
Paragraph 3 Necessity too is of two kinds.
Paragraph 4 Of the products of man's intelligence some are never due to chance or necessity but always to an end, as for example a house or a statue;
Paragraph 5 It is mostly in cases where the issue is indeterminate (though only where the production does not originate in chance, and the end is consequently good), that a result is due to an end, and this is true alike in nature or in art.

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