„As touching the gods, I do not know whether they exist or not, nor how they are featured; for there is much to prevent our knowing: the obscurity of the subject and the brevity of human life.“

—  Protagoras, Opening lines of Concerning the Gods (DK 80 B4). Variant translation: "As to the Gods, I have no means of knowing either that they exist or that they do not exist, or if they do, what they are like."
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Protagoras6
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„Do you believe in miracles?“

—  Federico Buffa, Riferita ai 13 punti in 35 secondi messi a segno da Tracy McGrady in Rockets-Spurs 9 dicembre 2004]

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„What do I know about God and the purpose of life?
I know that this world exists.“

—  Ludwig Wittgenstein Austrian-British philosopher 1889 - 1951
Context: What do I know about God and the purpose of life? I know that this world exists. That I am placed in it like my eye in its visual field. That something about it is problematic, which we call its meaning. This meaning does not lie in it but outside of it. That life is the world. That my will penetrates the world. That my will is good or evil. Therefore that good and evil are somehow connected with the meaning of the world. The meaning of life, i. e. the meaning of the world, we can call God. And connect with this the comparison of God to a father. To pray is to think about the meaning of life. Journal entry (11 June 1916), p. 72e and 73e

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„The hardest thing to do is to write straight honest prose on human beings. First you have to know the subject; then you have to know how to write.“

—  Ernest Hemingway American author and journalist 1899 - 1961
Context: The hardest thing to do is to write straight honest prose on human beings. First you have to know the subject; then you have to know how to write. Both take a lifetime to learn, and anybody is cheating who takes politics as a way out. All the outs are too easy, and the thing itself is too hard to do.

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„Thus mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true.“

—  Bertrand Russell logician, one of the first analytic philosophers and political activist 1872 - 1970
Ch. 5: Mathematics and the Metaphysicians

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„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?“

—  Louis Pasteur French chemist and microbiologist 1822 - 1895
Context: 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. 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.

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„I do know without fear of contradiction what the definition of life is and it is 12 words long. 'Life is defined by how much you improve the lives of others.'“

—  Keith Olbermann American sports and political commentator 1959
" Senior Convocation Speech http://www.news.cornell.edu/campus/Olbermann_speech.html," Cornell University (1998-05-23)

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