Well-observed Facts, Though Brought To Light By

Men Who Believe Too Firmly In Their Theories, Do Not Believe Enough In The Theories Of Others. So ... These Despisers Of Their Fellows ... Make Experiments Only To Destroy A Theory, Instead Of To Seek The Truth.

First Causes Are Outside The Realm Of Science.

The Stability Of The Internal Medium Is A Primary Condition For The Freedom And Independence Of Certain Living Bodies In Relation To The Environment Surrounding Them.

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.

When Entering On New Ground We Must Not Be Afraid To Express Even Risky Ideas So As To Stimulate Research In All Directions. As Priestley Put It, We Must Not Remain Inactive Through False Modesty Based On Fear Of Being Mistaken.