What can be said at all can be said clearly, and whereof one cannot speak one must be silent

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• Whereof one cannot speak, thereof one must be silent LWLudwig Wittgensteinc. 1921
• What can be shown cannot be said LWLudwig Wittgensteinc. 1921
• Nothing should be accepted as true unless it is known so clearly and distinctly that no ground for doubt remains RDRené Descartes8 Jun 1637
• Another soul can provoke me but not instruct me; I must find what it says true in myself or reject it RERalph Waldo Emerson15 Jul 1838
• A pleasant life is impossible without living wisely, well and justly, and living that way is impossible without living pleasantly EPEpicurusc. 341–270 BCE

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