We affirm the neutrality of Science ... Science is of no country. ... But if Science has no country, the scientist must keep in mind all that may work towards the glory of his country. In every great scientist will be found a great patriot.

Chance favours the trained mind.

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.

Life comes only from life.

Bernard was right. The germ is nothing, the terrain is everything.

It would seem to me that I was committing a theft if I were to let one day go by without doing some work.

Without theory, practice is but routine born of habit. Theory alone can bring forth and develop the spirit of inventions.