The Eloquence Of A Scientist Is Clarity;

Science Admits No Exceptions; Otherwise There Would Be No Determinism In Science, Or Rather, There Would Be No Science.

Progress Is Achieved By Exchanging Our Theories For New Ones Which Go Further Than The Old, Until We Find One Based On A Larger Number Of Facts. ... Theories Are Only Hypotheses, Verified By More Or Less Numerous Facts. Those Verified By The Most Facts Are The Best, But Even Then They Are Never Final, Never To Be Absolutely Believed.

Real Science Exists, Then, Only From The Moment When A Phenomenon Is Accurately Defined As To Its Nature And Rigorously Determined In Relation To Its Material Conditions, That Is, When Its Law Is Known. Before That, We Have Only Groping And Empiricism.

Even Mistaken Hypotheses And Theories Are Of Use In Leading To Discoveries. This Remark Is True In All The Sciences. The Alchemists Founded Chemistry By Pursuing Chimerical Problems And Theories Which Are False. In Physical Science, Which Is More Advanced Than Biology, We Might Still Cite Men Of Science Who Make Great Discoveries By Relying On False Theories.

In Teaching Man, Experimental Science Results In Lessening His Pride More And More By Proving To Him Every Day That Primary Causes, Like The Objective Reality Of Things, Will Be Hidden From Him Forever And That He Can Only Know Relations.