My strength lies solely in my tenacity.

If you suppress laboratories, physical science will be stricken with barrenness and death.

If science has no country, the scientist should have one, and ascribe to it the influence which his works may have in this world.

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.

My strength lies solely in my tenacity.

The greatest malfunction of spirit is to believe things.

It is surmounting difficulties that makes heroes.