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Top 70 Henri Poincaré Quotes (2025 Update)
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Henri Poincaré Quote: “A sane mind should not be guilty of a logical fallacy, yet there are very fine minds incapable of following mathematical demonstrations.”

51. “A sane mind should not be guilty of a logical fallacy, yet there are very fine minds incapable of following mathematical demonstrations.”

— Henri Poincaré

Henri Poincaré Quote: “If we knew exactly the laws of nature and the situation of the universe at the initial moment, we could predict exactly the situation of the same universe at a succeeding moment.”

52. “If we knew exactly the laws of nature and the situation of the universe at the initial moment, we could predict exactly the situation of the same universe at a succeeding moment.”

— Henri Poincaré

Henri Poincaré Quote: “In one word, to draw the rule from experience, one must generalize; this is a necessity that imposes itself on the most circumspect observer.”

53. “In one word, to draw the rule from experience, one must generalize; this is a necessity that imposes itself on the most circumspect observer.”

— Henri Poincaré

Henri Poincaré Quote: “One would have to have completely forgotten the history of science so as to not remember that the desire to know nature has had the most constant and the happiest influence on the development of mathematics.”

54. “One would have to have completely forgotten the history of science so as to not remember that the desire to know nature has had the most constant and the happiest influence on the development of mathematics.”

— Henri Poincaré

Henri Poincaré Quote: “But for harmony beautiful to contemplate, science would not be worth following.”

55. “But for harmony beautiful to contemplate, science would not be worth following.”

— Henri Poincaré

Henri Poincaré Quote: “If one looks at the different problems of the integral calculus which arise naturally when one wishes to go deep into the different parts of physics, it is impossible not to be struck by the analogies existing.”

56. “If one looks at the different problems of the integral calculus which arise naturally when one wishes to go deep into the different parts of physics, it is impossible not to be struck by the analogies existing.”

— Henri Poincaré

Henri Poincaré Quote: “It is the simple hypotheses of which one must be most wary; because these are the ones that have the most chances of passing unnoticed.”

57. “It is the simple hypotheses of which one must be most wary; because these are the ones that have the most chances of passing unnoticed.”

— Henri Poincaré

Henri Poincaré Quote: “A scientist worthy of his name, about all a mathematician, experiences in his work the same impression as an artist; his pleasure is as great and of the same nature.”

58. “A scientist worthy of his name, about all a mathematician, experiences in his work the same impression as an artist; his pleasure is as great and of the same nature.”

— Henri Poincaré

Henri Poincaré Quote: “A cat is witty, he has nerve, he knows how to do precisely the right thing at the right moment.”

59. “A cat is witty, he has nerve, he knows how to do precisely the right thing at the right moment.”

— Henri Poincaré

Henri Poincaré Quote: “Why is it that showers and even storms seem to come by chance, so that many people think it quite natural to pray for rain or fine weather, though they would consider it ridiculous to ask for an eclipse by prayer.”

60. “Why is it that showers and even storms seem to come by chance, so that many people think it quite natural to pray for rain or fine weather, though they would consider it ridiculous to ask for an eclipse by prayer.”

— Henri Poincaré

Henri Poincaré Quote: “Logic sometimes makes monsters. For half a century we have seen a mass of bizarre functions which appear to be forced to resemble as little as possible honest functions which serve some purpose.”

61. “Logic sometimes makes monsters. For half a century we have seen a mass of bizarre functions which appear to be forced to resemble as little as possible honest functions which serve some purpose.”

— Henri Poincaré

Henri Poincaré Quote: “Einstein does not remain attached to the classical principles, and when presented with a problem in physics he quickly envisages all of its possibilities. This leads immediately in his mind to the prediction of new phenomena which may one day be verified by experiment.”

62. “Einstein does not remain attached to the classical principles, and when presented with a problem in physics he quickly envisages all of its possibilities. This leads immediately in his mind to the prediction of new phenomena which may one day be verified by experiment.”

— Henri Poincaré

Henri Poincaré Quote: “It is a misfortune for a science to be born too late when the means of observation have become too perfect. That is what is happening at this moment with respect to physical chemistry; the founders are hampered in their general grasp by third and fourth decimal places.”

63. “It is a misfortune for a science to be born too late when the means of observation have become too perfect. That is what is happening at this moment with respect to physical chemistry; the founders are hampered in their general grasp by third and fourth decimal places.”

— Henri Poincaré

Henri Poincaré Quote: “Hypotheses are what we lack the least.”

64. “Hypotheses are what we lack the least.”

— Henri Poincaré

Henri Poincaré Quote: “For a long time the objects that mathematicians dealt with were mostly ill-defined; one believed one knew them, but one represented them with the senses and imagination; but one had but a rough picture and not a precise idea on which reasoning could take hold.”

65. “For a long time the objects that mathematicians dealt with were mostly ill-defined; one believed one knew them, but one represented them with the senses and imagination; but one had but a rough picture and not a precise idea on which reasoning could take hold.”

— Henri Poincaré

Henri Poincaré Quote: “Just as houses are made of stones, so is science made of facts.”

66. “Just as houses are made of stones, so is science made of facts.”

— Henri Poincaré

Henri Poincaré Quote: “Mathematical discoveries, small or great are never born of spontaneous generation They always presuppose a soil seeded with preliminary knowledge and well prepared by labour, both conscious and subconscious.”

67. “Mathematical discoveries, small or great are never born of spontaneous generation They always presuppose a soil seeded with preliminary knowledge and well prepared by labour, both conscious and subconscious.”

— Henri Poincaré

Henri Poincaré Quote: “In the old days when people invented a new function they had something useful in mind.”

68. “In the old days when people invented a new function they had something useful in mind.”

— Henri Poincaré

Henri Poincaré Quote: “Talk with M. Hermite. He never evokes a concrete image, yet you soon perceive that the more abstract entities are to him like living creatures.”

69. “Talk with M. Hermite. He never evokes a concrete image, yet you soon perceive that the more abstract entities are to him like living creatures.”

— Henri Poincaré

Henri Poincaré Quote: “A reality completely independent of the spirit that conceives it, sees it, or feels it, is an impossibility. A world so external as that, even if it existed, would be forever inaccessible to us.”

70. “A reality completely independent of the spirit that conceives it, sees it, or feels it, is an impossibility. A world so external as that, even if it existed, would be forever inaccessible to us.”

— Henri Poincaré

Henri Poincaré Quote: “But all of my efforts served only to make me better acquainted with the difficulty, which in itself was something.”

71. “But all of my efforts served only to make me better acquainted with the difficulty, which in itself was something.”

— Henri Poincaré

Henri Poincaré Quote: “When the physicists ask us for the solution of a problem, it is not drudgery that they impose on us, on the contrary, it is us who owe them thanks.”

72. “When the physicists ask us for the solution of a problem, it is not drudgery that they impose on us, on the contrary, it is us who owe them thanks.”

— Henri Poincaré

Henri Poincaré Quote: “Thus, be it understood, to demonstrate a theorem, it is neither necessary nor even advantageous to know what it means...”

73. “Thus, be it understood, to demonstrate a theorem, it is neither necessary nor even advantageous to know what it means...”

— Henri Poincaré

Henri Poincaré Quote: “Need we add that mathematicians themselves are not infallible?”

74. “Need we add that mathematicians themselves are not infallible?”

— Henri Poincaré

Henri Poincaré Quote: “One does not ask whether a scientific theory is true, but only whether it is convenient.”

75. “One does not ask whether a scientific theory is true, but only whether it is convenient.”

— Henri Poincaré

Henri Poincaré Quote: “All great progress takes place when two sciences come together, and when their resemblance proclaims itself, despite the apparent disparity of their substance.”

76. “All great progress takes place when two sciences come together, and when their resemblance proclaims itself, despite the apparent disparity of their substance.”

— Henri Poincaré

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