[Footnote 60: Plato, Parmenid. pp. 136 C, 137 A. Hobbes remarks (Computatio sive Logica, Part I, ch. iii. s. 12), "Learners ought to go through logical exercises silently and by themselves: for it will be thought both ridiculous and absurd, for a man to use such language publicly". Proklus tells us, that the difficulty of the [Greek: gumnasi/a] here enjoined by the Platonic Parmenides is so prodigious, that no one after Plato employed it (Prokl. ad Parmenid. p. 306, p. 801, Stallb.). [Greek: ei) me\n ou)=n plei/ous ê)=men, ou)k a)\n a)/xion ê)=n dei=sthai. a)prepê= ga\r ta\ toiau=ta pollô=n e)nanti/on le/gein, a)/llôs te kai\ têlikou/tô|; a)gnoou=si ga\r oi( polloi\ o(/ti a)neu tau/tês tê=s dia\ pa/ntôn diexo/dou kai\ pla/nês a)du/naton e)ntucho/nta tô=| a)lêthei= nou=n schei=n.]] [Footnote 61: Plato, Parmenides, p. 137 B; compare Sophistes, p. 217 D. To understand the force of this remark of Parmenides, we should contrast it with the precepts given by Aristotle in the Topica for dialectic debate: precepts teaching the questioner how to puzzle, and the respondent how to avoid being puzzled. Such precautions are advised to the respondent by Aristotle, not merely in the Topica but also in the Analytica--[Greek: chrê\ d' o(/per phula/ttesthai paragge/llomen a)pokrinome/nous, au)tou\s e)picheirou=ntas peira=sthai lantha/nein] (Anal. Priora, ii. p. 66, a. 33).] [Side-note: The exercises exhibited by Parmenides are exhibited only as illustrative specimens of a method enjoined to be applied to many other Antinomies.]