Frases de Louis Pasteur

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Louis Pasteur

Data de nascimento: 27. Dezembro 1822
Data de falecimento: 28. Setembro 1895

Louis Pasteur foi um cientista francês, cujas descobertas tiveram enorme importância na história da química e da medicina. É reconhecido pelas suas notáveis descobertas das causas e prevenções de doenças. Entre seus feitos mais notáveis podem-se citar a redução da mortalidade e a criação da primeira vacina contra a raiva . As suas experiências deram fundamento para a teoria microbiológica da doença. Foi mais conhecido do público em geral por inventar um método para impedir que leite e vinho causem doenças, um processo que veio a ser chamado pasteurização, em homenagem ao seu sobrenome.Pasteur é considerado um dos três principais fundadores da microbiologia, juntamente com Ferdinand Cohn e Robert Koch. Também fez muitas descobertas no campo da química, principalmente a base molecular para a assimetria de certos cristais. O seu corpo está enterrado sob o Instituto Pasteur em Paris, numa tumba decorada por mosaicos em estilo bizantino que lembram os seus feitos. Wikipedia

Citações Louis Pasteur

„Qualquer criança me desperta dois sentimentos: ternura pelo que ela é e respeito pelo que poderá vir a ser.“

—  Louis Pasteur

un enfant, il m'inspire deux sentiments : celui de la tendresse dans le présent, celui du respect pour ce qu'il peut être un jour
Correspondance, 1840-1895, Volume 4‎ - Página 342, Louis Pasteur - B. Grasset, 1946
Variante: Quando vejo uma criança, ela inspira-me dois sentimentos: ternura, pelo que é, e respeito pelo que pode vir a ser.

„O vinho pode ser considerado a mais sã e higiênica das bebidas.“

—  Louis Pasteur

le vin peut être à bon droit considéré comme la plus saine, la plus hygiénique des boissons.
Etudes sur le vin, ses maladies, causes qui les provoquent, procédés nouveaux pour le conserver et pour le vieillir - páina 56 http://books.google.com.br/books?id=87UvAQAAMAAJ&pg=PA56, Louis Pasteur - Impr. impériale, 1866, 264 páginas

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„Estou à beira de mistérios e do véu está ficando cada vez mais magro.“

—  Louis Pasteur

como citado em The Great Influenza: The Epic Story of the Deadliest Plague In History (2004) por John M. Barry

„How do you know that in ten thousand years, one will not consider it more likely that matter has emerged from life?“

—  Louis Pasteur

Partially quoted in René Dubos, Louis Pasteur: Free Lance of Science, Da Capo Press, Inc., 1950. p 396.
Original in French: «La génération spontanée, je la cherche sans la découvrir depuis vingt ans. Non, je ne la juge pas impossible. Mais quoi donc vous autorise à vouloir qu'elle ait été l'origine de la vie? Vous placez la matière avant la vie et vous faites la matière existante de toute éternité. Qui vous dit que, le progrès incessant de la science n'obligera pas les savants, qui vivront dans un siècle, dans mille ans, dans dix mille ans... à affirmer que la vie a été de toute éternité et non la matière.? Vous passez de la matière à la vie parce que votre intelligence actuelle, si bornée par rapport à ce que sera l'intelligence des naturalistes futurs, vous dit qu'elle ne peut comprendre autrement les choses. Qui m'assure que dans dix mille ans on ne considérera pas que c'est de la vie qu'on croira impossible de ne pas passer à la matière? Si vous voulez être au nombre des esprits scientifiques, s, qui seuls comptent, il faut vous débarrasser des idées et des raisonnements a priori et vous en tenir aux déductions nécessaires des faits établis et ne pas accorder plus de confiance qu'il ne faut aux déductions de pures hypothèses." (Pasteur et la philosophie,Patrice Pinet, Editions L'Harmattan, p. 63.
Contexto: I have been looking for spontaneous generation for twenty years without discovering it. No, I do not judge it impossible. But what allows you to make it the origin of life? You place matter before life and you decide that matter has existed for all eternity. How do you know that the incessant progress of science will not compel scientists to consider that life has existed during eternity, and not matter? You pass from matter to life because your intelligence of today cannot conceive things otherwise. How do you know that in ten thousand years, one will not consider it more likely that matter has emerged from life? You move from matter to life because your current intelligence, so limited compared to what will be the future intelligence of the naturalist, tells you that things cannot be understood otherwise. If you want to be among the scientific minds, what only counts is that you will have to get rid of a priori reasoning and ideas, and you will have to do necessary deductions not giving more confidence than we should to deductions from wild speculation.

„Do you understand now the relationship between the question of spontaneous generation and the major problems that I listed in the beginning?“

—  Louis Pasteur

Original in French: Comprenez-vous maintenant le lien qui existe entre la question des générations spontanées et ces grands problèmes que j'ai énumérés en commençant? Mais, messieurs, dans un pareil sujet, assez de poésie comme cela, assez de fantaisie et de solutions instinctives; il est temps que la science, la vraie méthode reprenne ses droits et les exerce. Il n'y a ici ni religion, ni philosophie, ni athéisme, ni matérialisme, ni spiritualisme qui tienne. Je pourrais même ajouter : Comme savant, peu m'importe. C'est une question de fait; je l'ai abordée sans idée préconçue, aussi prêt à déclarer, si l'expérience m'en avait imposé l'aveu, qu'il existe des générations spontanées, que je suis persuadé aujourd'hui que ceux qui les affirment ont un bandeau sur les veux.
Also found in Histoire du développement de la biologie, Volume 3, by Hendrik Cornelius Dirk de Wit (1994), PPUR presses polytechniques, p. 393
Soirées scientifiques de la Sorbonne (1864)
Contexto: Do you understand now the relationship between the question of spontaneous generation and the major problems that I listed in the beginning? But, gentlemen, in such a subject, rather than as poetry, pretty fancy and instinctive solutions, it is time for science, the true method resumes its duties and exercise. Here, it takes no religion, no philosophy, no atheism, no materialism, no spiritualism. I might even add: as a scholar, I do not mind. It is a matter of fact; I approached without a preconceived idea, too ready to declare, if the experiment had imposed upon me the confession, that there was a spontaneous generation, of which I am convinced today that those who assure it are blindfolded.

„How is it that you do not see the essential difference between my opponents and myself? Not only have I contradicted, proof in hand, every one of their assertions, while they have never dared to seriously contradict one of mine, but, for them, every cause of error benefits their opinion.“

—  Louis Pasteur

Original in French from Œuvres de Pasteur, Volume 7 (1939), Masson et cie, p. 539: Mon opinion, mieux encore, ma conviction, c'est que, dans l'état actuel de la science, comme vous dites avec raison, la génération spontanée est une chimère, et il vous serait impossible de me contredire, car mes expériences sont toutes debout, et toutes prouvent que la génération spontanée est une chimère
Contexto: You say that, in the present state of science, it is wiser to have no opinion: well, I have an opinion, not a sentimental one, but a rational one, having acquired a right to it by twenty years of assiduous labour, and it would be wise in every impartial mind to share it. My opinion — nay more, my conviction — is that, in the present state of science, as you rightly say, spontaneous generation is a chimera; and it would be impossible for you to contradict me, for my experiments all stand forth to prove that spontaneous generation is a chimera. What is then your judgment on my experiments? Have I not a hundred times placed organic matter in contact with pure air in the best conditions for it to produce life spontaneously? Have I not practised on these organic materia which are most favourable, according to all accounts, to the genesis of spontaneity, such as blood, urine, and grape juice? How is it that you do not see the essential difference between my opponents and myself? Not only have I contradicted, proof in hand, every one of their assertions, while they have never dared to seriously contradict one of mine, but, for them, every cause of error benefits their opinion. For me, affirming as I do that there are no spontaneous fermentations, I am bound to eliminate every cause of error, every perturbing influence, I can maintain my results only by means of most irreproachable experiments; their opinions, on the contrary, profit by every insufficient experiment and that is where they find their support.

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