The Doubter Is A True Man Of

Effects Vary With The Conditions Which Bring Them To Pass, But Laws Do Not Vary. Physiological And Pathological States Are Ruled By The Same Forces; They Differ Only Because Of The Special Conditions Under Which The Vital Laws Manifest Themselves.

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.

In The Philosophic Sense, Observation Shows And Experiment Teaches.

Those Who Do Not Know The Torment Of The Unknown Cannot Have The Joy Of Discovery.

We Must Never Make Experiments To Confirm Our Ideas, But Simply To Control Them.