There Is A Time In

Without Theory, Practice Is But Routine Born Of Habit. Theory Alone Can Bring Forth And Develop The Spirit Of Inventions.

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.

Preconceived Ideas Are Like Searchlights Which Illumine The Path Of The Experimenter And Serve Him As A Guide To Interrogate Nature. They Become A Danger Only If He Transforms Them Into Fixed Ideas-this Is Why I Should Like To See These Profound Words Inscribed On The Threshold Of All The Temples Of Science: 'the Greatest Derangement Of The Mind Is To Believe In Something Because One Wishes It To Be So.'

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.

Do Not Let Yourself Be Tainted With A Barren Skepticism.