When you believe you have found an important scientific fact, and are feverishly curious to publish it, constrain yourself for days, weeks, years sometimes, fight yourself, try and ruin your own experiments, and only proclaim your discovery after having exhausted all contrary hypotheses. But when, after so many efforts you have at last arrived at a certainty, your joy is one of the greatest which can be felt by a human soul.

In matters of observation chance favors only the prepared mind. (not literal translation) - Dan's les champs de observation le hasard ne favorise que les esprits prepares.

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.

The grandeur of the acts of men are measured by the inspiration from which they spring.

In the fields of observation chance favors only those minds which are prepared.

The nights seem to me too long... I am often scolded by Madame Pasteur, but I tell her I shall lead her to fame.

My strength lies solely in my tenacity.