First Causes Are Outside The Realm 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.

[those] Who Have An Excessive Faith In Their Theories Or In Their Ideas Are Not Only Poorly Disposed To Make Discoveries, But They Also Make Very Poor Observations.

Our Ideas Are Only Intellectual Instruments Which We Use To Break Into Phenomena; We Must Change Them When They Have Served Their Purpose, As We Change A Blunt Lancet That We Have Used Long Enough.

Priestley [said] That Each Discovery We Make Shows Us Many Others That Should Be Made.

First Causes Are Outside The Realm Of Science.