Rules for Demonstrations. I. Not to undertake to demonstrate any thing that is so evident of itself that nothing can be given that is clearer to prov… - Blaise Pascal

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Rules for Demonstrations. I. Not to undertake to demonstrate any thing that is so evident of itself that nothing can be given that is clearer to prove it. II. To prove all propositions at all obscure, and to employ in their proof only very evident maxims or propositions already admitted or demonstrated. III. To always mentally substitute definitions in the place of things defined, in order not to be misled by the ambiguity of terms which have been restricted by definitions.

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About Blaise Pascal

Blaise Pascal (19 June 1623 – 19 August 1662) was a French mathematician, logician, physicist and theologian.

Biography information from Wikiquote

Also Known As

Pen Names: Louis de Montalte Amos Dettonville Salomon de Tultie
Alternative Names: Pascal Dettonville Paskal Blez

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Nobody is publicly accepted as an expert on poetry unless he displays the sign of poet, mathematician, etc., but universal men want no sign and make hardly any distinction between the crafts of poet and embroiderer.
Universal men are not called poets or mathematicians, etc. But they are all these things and judges of them too. No one could guess what they are, and they will talk about whatever was being talked about when they came in. One quality is not more noticeable in them than another, unless it becomes necessary to put it into practice, and then we remember it.

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Thus I stretch out my arms to my Saviour, who, after being foretold for four thousand years, came on earth to die and suffer for me at the time and in the circumstances foretold. By his grace I peaceably await death, in the hope of being eternally united to him, and meanwhile I live joyfully, whether in the blessings which he is pleased to bestow on me or in the affliction he sends me for my own good and taught me how to endure by his example.

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