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Ideas for 'works (fragments)', 'Lives of Eminent Philosophers' and 'Cartesian Meditations'

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13. Knowledge Criteria / A. Justification Problems / 1. Justification / c. Defeasibility

20797

If a grasped perception cannot be shaken by argument, it is 'knowledge' [Zeno of Citium, by Cicero]

13. Knowledge Criteria / A. Justification Problems / 2. Justification Challenges / a. Agrippa's trilemma

1816	Sceptics say demonstration depends on self-demonstrating things, or indemonstrable things [Diog. Laertius]