Hatred Is The Most Clear- Sighted, Next

Men Who Have Excessive Faith In Their Theories ... Make Poor Observations, Because They Choose Among The Results Of Their Experiments Only What Suits Their Object, Neglecting Whatever Is Unrelated To It And Carefully Setting Aside Everything Which Might Tend Toward The Idea They Wish To Combat

The Better Educated We Are And The More Acquired Information We Have, The Better Prepared Shall We Find Our Minds For Making Great And Fruitful Discoveries.

To Be Worthy Of The Name, An Experimenter Must Be At Once Theorist And Practitioner. While He Must Completely Master The Art Of Establishing Experimental Facts, Which Are The Materials Of Science, He Must Also Clearly Understand The Scientific Principles Which Guide His Reasoning Through The Varied Experimental Study Of Natural Phenomena. We Cannot Separate These Two Things: Head And Hand. An Able Hand, Without A Head To Direct It, Is A Blind Tool; The Head Is Powerless Without Its Executive Hand.

When A Physician Is Called To A Patient, He Should Decide On The Diagnosis, Then The Prognosis, And Then The Treatment. ... Physicians Must Know The Evolution Of The Disease, Its Duration And Gravity In Order To Predict Its Course And Outcome. Here Statistics Intervene To Guide Physicians, By Teaching Them The Proportion Of Mortal Cases, And If Observation Has Also Shown That The Successful And Unsuccessful Cases Can Be Recognized By Certain Signs, Then The Prognosis Is More Certain.

It Is Impossible To Devise An Experiment Without A Preconceived Idea; Devising An Experiment, We Said, Is Putting A Question; We Never Conceive A Question Without An Idea Which Invites An Answer. I Consider It, Therefore, An Absolute Principle That Experiments Must Always Be Devised In View Of A Preconceived Idea, No Matter If The Idea Be Not Very Clear Nor Very Well Defined.