Zitate Louis Pasteur

„Where are the real sources of human dignity, freedom and modern democracy, if not in the concept of infinity to which all men are equal?“

—  Louis Pasteur

Original: Où sont les vraies sources de la dignité humaine, de la liberté et de la démocratie moderne, sinon dans la notion de l’infini devant laquelle tous les hommes sont égaux?

„It is surmounting difficulties that makes heroes.“

—  Louis Pasteur

Lajos Kossuth (also known as Louis Kossoth), as quoted in Human Development in Action (1942) by University of California, and The Forbes Book of Business Quotations (1997) by Edward C. Goodman and Ted Goodman.
Misattributed

„When I approach a child, he inspires in me two sentiments; tenderness for what he is, and respect for what he may become.“

—  Louis Pasteur

The phrase in French is found in Étienne Blanchard (1941), "Recueil d'idées", p. 76: "Quand je m'approche d'un enfant, il m'inspire deux sentiments: la tendresse pour ce qu'il est, et le respect pour ce qu'il peut être un jour." It doesn't give any reference, just like modern books which include the quote in English.
Disputed

„In the fields of observation chance favours only the prepared mind.“

—  Louis Pasteur

Dans les champs de l'observation le hasard ne favorise que les esprits préparés.
Lecture, University of Lille (7 December 1854)
Alternate translations of this or similar statements include:
Chance favors the prepared mind.
Fortune favors the prepared mind.
In the field of observation, chance favors the prepared mind.
Where observation is concerned, chance favors only the prepared mind.

„The more I know, the more nearly is my faith that of the Breton peasant. Could I but know all I would have the faith of a Breton peasant woman.“

—  Louis Pasteur

As quoted in "Louis Pasteur" in The Catholic Encyclopedia (1913)
As quoted in Letter to an Atheist (2007) by Michael Patrick Leahy, p. 61
His descendents, Louis-Pasteur Vallery-Radot, and Maurice Vallery-Radot disputed the authenticity of such statements. According to Maurice Vallery-Radot, Pasteur (1994), p. 378, the attributed assertion first appeared in the Semaine religieuse .... du diocèse de Versailles (6 October 1895), p. 153, shortly after the death of Pasteur.
Disputed
Variante: I have the faith of a Breton peasant and by the time I die I hope to have the faith of a Breton peasant's wife.

„A little science estranges men from God, but much science leads them back to Him.“

—  Louis Pasteur

This alleged quotation is attributed to Pasteur at least as early as 1952, in Miracles, by Morvan Lebesque. It appears in a letter about Pasteur reprinted in the February 7, 1920 issue of America magazine, but the author of the letter attributes the saying to Pascal and says it applies to Pasteur. It may be a paraphrase of Francis Bacon, in "On Atheism" in Essays (1597): A little Philosophy inclineth Mans Minde to Atheisme; But depth in Philosophy, bringeth Mens Mindes about to Religion.
Misattributed

„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.“

—  Louis Pasteur

Original: (fr) 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."

As quoted in Pasteur et la philosophie (2004), by Patrice Pinet, p. 63

Partially quoted in Louis Pasteur : Free Lance of Science (1950) by René Dubos, p 396

„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.“

—  Louis Pasteur

p. 242; The first statement in bold in the above paragraph, as quoted from in Œuvres de Pasteur, Volume 7 (1939), Masson et cie, p. 539 reads:
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

„The Greeks understood the mysterious power of the underside of things. They are the ones who gave us one of the most beautiful words in our language, the word enthusiasm.“

—  Louis Pasteur

Εν Θεος - A God within.

Variant translation: "The Greeks have given us one of the most beautiful words of our language, the word "enthusiasm" Εν Θεος .— a God within. The grandeur of the acts of men are measured by the inspiration from which they spring. Happy is he who bears a God within." (As quoted in Spiritual Literacy : Reading the Sacred in Everyday Life (1998) by Frederic Brussat and Mary Ann Brussat)

Original: Les Grecs avaient compris la mystérieuse puissance de ce dessous de choses. Ce sont eux qui nous ont légué un des plus beaux mots de notre langue, le mot enthousiasme. —Εν Θεος. — Un Dieu intérieur.

„Now, gentlemen, there will be a beautiful story: what is the role, in the overall scheme of creation, of some of these little beings who are the agents of fermentation, the agents of putrefaction, of disorganization of everything that life has had in the surface of the globe. This role is immense, marvelous, really moving. Maybe one day maybe I will be given [the opportunity] to explain here some of these results. May God grant it to be still in the presence of such a brilliant assembly!“

—  Louis Pasteur

Original in French: Maintenant, messieurs, il y aurait un beau sujet à traiter : c’est celui du rôle, dans l’économie générale de la création, de quelques-uns de ces petits êtres qui sont les agents de la fermentation, les agents de la putréfaction, de la désorganisation de tout ce qui a eu vie il la surface du globe. Ce rôle est immense, merveilleux, vraiment émouvant. Un jour peut-être me sera-t-il donné de vous exposer ici quelques-uns de ces résultats. Dieu veuille que ce soit encore en présence à une aussi brillante assemblée!
Soirées scientifiques de la Sorbonne (1864)

„I am on the edge of mysteries and the veil is getting thinner and thinner.“

—  Louis Pasteur

Letter (December 1851); as quoted in The Great Influenza: The Epic Story of the Deadliest Plague In History (2004) by John M. Barry
Variant translations:
I am on the verge of mysteries and the veil is getting thinner and thinner. The nights seem to me too long... I am often scolded by Madame Pasteur, but I tell her I shall lead her to fame.
Microbe Hunters (1926) by Paul De Kruif
My plan of study is traced for this coming year... I am hoping to develop it shortly in the most successful manner... I think that I have already told you that I am on the verge of mysteries, and that the veil which covers them is getting thinner and thinner. The nights seem to me too long, yet I do not complain... I am often scolded by Mme. Pasteur, but I console her by telling her that I shall lead her to fame.
The Life of Pasteur (1916) by René Vallery-Radot

„Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Etiam egestas wisi a erat. Morbi imperdiet, mauris ac auctor dictum.“

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