Aristotle - The Organon TOPICA Book 1 Part 16

Difference should be examined in same genera

1. The presence, then, of a number of meanings in a term may be investigated by these and like means. The differences which things present to each other should be examined within the same genera, e.g. 'Wherein does justice differ from courage, and wisdom from temperance?' - for all these belong to the same genus; and also from one genus to another, provided they be not very much too far apart, e.g. 'Wherein does sensation differ from knowledge?': for in the case of genera that are very far apart, the differences are entirely obvious.

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