If science has no country, the scientist should have one, and ascribe to it the influence which his works may have in this world.
There are two men in each one of us: the scientist, he who starts with a clear field and desires to rise to the knowledge of Nature through observations, experimentation and reasoning, and the man of sentiment, the man of belief, the man who mourns his dead children, and who cannot, alas, prove that he will see them again, but who believes that he will, and lives in the hope – the man who will not die like a vibrio, but who feels that the force that is within him cannot die.
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?
If perchance you should falter during the journey, a hand would be there to support you. If that should be wanting, God, who alone could take that hand from you, would Himself accomplish its work.
If you suppress laboratories, physical science will be stricken with barrenness and death.
Imagination should give wings to our thoughts but we always need decisive experimental proof, and when the moment comes to draw conclusions and to interpret the gathered observations, imagination must be checked and documented by the factual results of the experiment.
... by chance you will say, but chance only favors the mind which is prepared.
Did you ever observe to whom the accidents happen? Chance favors only the prepared mind.
Science proceeds by successive answers to questions more and more subtle, coming nearer and nearer to the very essence of phenomena.
I am on the edge of mysteries and the veil is getting thinner and thinner.
Virulence appears in a new light which cannot but be alarming to humanity; unless nature, in her evolution down the ages (an evolution which, as we now know, has been going on for millions, nay, hundreds of millions of years), has finally exhausted all the possibilities of producing virulent or contagious diseases - which does not seem very likely.
After death, life reappears in a different form and with different laws. It is inscribed in the laws of the permanence of life on the surface of the earth and everything that has been a plant and an animal will be destroyed and transformed into a gaseous, volatile and mineral substance.
Nothing is lost and nothing is created in the operations of art as those of nature.
What did you do today to receive your instruction?
Analogy cannot serve as proof.
Outsidetheir laboratories, thephysicianand chemist are soldiers without arms on the field of battle.
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.
Science belongs to no one country.
There does not exist a category of science to which one can give the name applied science. There are sciences and the applications of science, bound together as the fruit of the tree which bears it.
The nights seem to me too long... I am often scolded by Madame Pasteur, but I tell her I shall lead her to fame.
As in the experimental sciences, truth cannot be distinguished from error as long as firm principles have not been established through the rigorous observation of facts.
These are the living springs of great thoughts and great actions. Everything grows clear in the reflections from the Infinite.
The universe is an asymmetrical entity. I am inclined to believe that life as it is manifested to us must be a function of the asymmetry of the universe or of the consequence of this fact. The universe is asymmetrical; for if one placed the entire set of bodies that compose the solar system, each moving in its own way, before a mirror, the image shown would not be superimposable on the reality.
Worship the spirit of criticism. If reduced to itself it is not an awakener of ideas or a stimulant to great things, but, without it, everything is fallible; it always has the last word.
Work usually follows will.
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