Feeling Alone Guides The Mind.

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.

The Eloquence Of A Scientist Is Clarity; Scientific Truth Is Always More Luminous When Its Beauty Is Unadorned Than When It Is Tricked Out In The Embellishments With Which Our Imagination Would Seek To Clothe It.

The True Worth Of An Experimenter Consists In His Pursuing Not Only What He Seeks In His Experiment, But Also What He Did Not Seek.

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

A Great Discovery Is A Fact Whose Appearance In Science Gives Rise To Shining Ideas, Whose Light Dispels Many Obscurities And Shows Us New Paths.