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“Nothing takes place in the world whose meaning is not that of some maximum or minimum.”
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“Logic is the foundation of the certainty of all the knowledge we acquire.”
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“Madam, I have just come from a country where people are hanged if they talk.”
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“e^(iπ)+1 = 0”
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“Mathematicians have tried in vain to this day to discover some order in the sequence of prime numbers, and we have reason to believe that it is a mystery into which the human mind will never penetrate.”
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“The kind of knowledge which is supported only by observations and is not yet proved must be carefully distinguished from the truth; it is gained by induction, as we usually say. Yet we have seen cases in which mere induction led to error.”
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“Die Mathematik ist es, die uns vor dem Trug der Sinne schützt und uns den Unterschied zwischen Schein und Wahrheit kennen lehrt.”
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“Quand mon cerveau excite dans mon ame la sensation d'un arbre ou d'une maison, je prononce hardiment, qu'il existe réellement hors de moi un arbre ou une maison, dont je connois même le lieu, la grandeur ou d'autres propriétés. Ainsi ne trouve-t-on ni homme ni bête qui doutent de cette vérité. Si un paysan en vouloit douter ; s'il disoit, par exemple, qu'il ne croyait pas que son baillif existe, quoiqu'il fut devant lui, on le pretendroit pour un fou et cela avec raison : mais dès qu'un philosophe avance de tels sentimens, il veut qu'on admire son esprit et ses lumières, qui surpassent infiniment celles du peuple.”
― Letters of Euler to a German princess, on different subjects in physics and philosophy. Translated from the French by Henry Hunter, D.D. With original ... terms. In two volumes. ... Volume 1 of 2
― Letters of Euler to a German princess, on different subjects in physics and philosophy. Translated from the French by Henry Hunter, D.D. With original ... terms. In two volumes. ... Volume 1 of 2




