In a similar way division is valuable both for proof
and refutation. For proof, it is sometimes enough to
establish one thing. “To be a citizen, a man must
either have been born or made such.” For refutation,
both points must be disproved: “he was neither born
nor made a citizen.”
Quintilian. With An English Translation. Harold Edgeworth Butler. Cambridge. Cambridge, Mass., Harvard University Press; London, William Heinemann, Ltd. 1921.
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