Feeling Alone Guides The Mind.

We Must Alter Theory To Adapt It To Nature, But Not Nature To Adapt It To Theory.‎

The Minds That Rise And Become Really Great Are Never Self-satisfied, But Still Continue To Strive.

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.

Science Does Not Permit Exceptions.

[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.