„By doubting we come to examine, and by examining we reach the truth.“

— Piotr Abelard, Context: I have ventured to bring together various dicta of the holy fathers, as they came to mind, and to formulate certain questions which were suggested by the seeming contradictions in the statements. These questions ought to serve to excite tender readers to a zealous inquiry into truth and so sharpen their wits. The master key of knowledge is, indeed, a persistent and frequent questioning. Aristotle, the most clear-sighted of all the philosophers, was desirous above all things else to arouse this questioning spirit, for in his Categories he exhorts a student as follows: "It may well be difficult to reach a positive conclusion in these matters unless they be frequently discussed. It is by no means fruitless to be doubtful on particular points." By doubting we come to examine, and by examining we reach the truth. Introduction as translated in Readings in European History, Vol. I (1904) edited by James Harvey Robinson, p. 451 Variant translation: Constant and frequent questioning is the first key to wisdom … For through doubting we are led to inquire, and by inquiry we perceive the truth. Prologue as translated in A History of Education During the Middle Ages and the Transition to Modern Times (1918) by Frank Pierrepont Graves; 2005 edition, p. 53<!-- translation of Prima sapientiae clavis definitur, assidua scilicet seu frequens interrogatio … Dubitando enim ad inquisitionem venimus; inquirendo veritatem percipimus. -->

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Piotr Abelard3
średniowieczny filozof i kaznodzieja 1079 - 1142
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„When we examine the opinions of men, we find that nothing is more uncommon, than common sense; or, in other words, they lack judgment to discover plain truths, or to reject absurdities, and palpable contradictions.“

— Baron d'Holbach French-German author, philosopher, encyclopedist 1723 - 1789
Good Sense without God, or, Freethoughts Opposed to Supernatural Ideas (London: W. Stewart & Co., ca. 1900) ( Project Gutenberg e-text http://www.gutenberg.org/dirs/etext05/gsens10.txt), preface Translator unknown. Original publication in French at Amsterdam, 1772, as Le bon sens ("Common Sense"), and often attributed to John Meslier.

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„What we need is not truths that serve us but a truth we may serve.“

— Jacques Maritain, Degrees of Knowledge
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„When truth was revealed to me I never doubted it.“

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„The greatest danger for most of us is not that our aim is too high and we miss it, but that it is too low and we reach it.“

— Michelangelo Buonarroti Italian sculptor, painter, architect and poet 1475 - 1564
Attributed without citation in Ken Robinson, The Element (2009), p. 260. Widely attributed to Michelangelo since the late 1990s, this adage has not been found before 1980 when it appeared without attribution in E. C. McKenzie, Mac's giant book of quips & quotes.

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„I don't think the human race will survive the next thousand years, unless we spread into space. There are too many accidents that can befall life on a single planet. But I'm an optimist. We will reach out to the stars.“

— Stephen Hawking British theoretical physicist, cosmologist, and author 1942
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„We have all known the long loneliness and we have learned that the only solution is love and that love comes with community.“

— Dorothy Day, The Long Loneliness: The Autobiography of the Legendary Catholic Social Activist
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