[70]
two propositions are stated of such
a character that the admission of either involves
the same conclusion, as in the sentence, “We must
philosophise, even though we ought not,” or as in
the common dilemma, “What is the use of a figure,1
if its meaning is clear? And what is its use, if it
is unintelligible?” or, “He who is capable of enduring pain will lie if tortured, and so will he who
cannot endure pain.”
1 See vii. iv. 28, ix. i. 14, ix. ii. 65.
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