Life Comes Only From Life.

It Is Surmounting Difficulties That Makes Heroes.

Every Chemical Substance, Whether Natural Or Artificial, Falls Into One Of Two Major Categories, According To The Spatial Characteristic Of Its Form. The Distinction Is Between Those Substances That Have A Plane Of Symmetry And Those That Do Not. The Former Belong To The Mineral, The Latter To The Living World.

Nothing Is Lost And Nothing Is Created In The Operations Of Art As Those Of Nature.

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.

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.