Aristotle - The Organon - index for CATEGORIAE Book 1 Part 11


Paragraph 1 That the contrary of a good is an evil is shown by induction:
Paragraph 2 In the case of contraries, it is not always necessary that if one exists the other should also exist:
Paragraph 3 It is plain that contrary attributes must needs be present in subjects which belong to the same species or genus.
Paragraph 4 Moreover, it is necessary that pairs of contraries should in all cases either belong to the same genus or belong to contrary genera or be themselves genera.

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