Luck favors the mind that is prepared.

There is no such thing as applied science, only the application of pure science.

The artificial products do not have any molecular dissymmetry; and I could not indicate the existence of a more profound separation between the products born under the influence of life and all the others.

Science belongs to no one country.

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.

To demonstrate experimentally that a microscopic organism actually is the cause of a disease and the agent of contagion, I know no other way, in the present state of Science, than to subject the microbe (the new and happy term introduced by M. Sédillot) to the method of cultivation out of the body.

Intuition is given only to him who has undergone long preparation to receive it.