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For as this idea arises from a
number of similar instances, and not from any single instance, it must
arise from that circumstance, in which the number of instances
differ from every individual instance.

Word:

particular

Question:

Why does the idea arise from the circumstance where the number of instances differ from every individual instance?

Answer (optional):

Why does the idea arise from the circumstance where the number of instances differ from every individual instance?

The idea arises from the circumstance where the number of instances differ from every individual instance because this customary connexion or transition of the imagination is the only circumstance in which they differ, and as this idea arises from a number of similar instances, and not from any single instance, it must arise from that circumstance.