We Never Know What We Are Talking

If You Can't Say It Simply And Clearly, Keep Quiet, And Keep Working On It Till You Can.

A System Is Empirical Or Scientific Only If It Is Capable Of Being Tested By Experience. These Considerations Suggest That Not The Verifiability But The Falsifiability Of A System Is To Be Taken As A Criterion Of Demarcation... It Must Be Possible For An Empirical Or Scientific System To Be Refuted By Experience.

The History Of Science, Like The History Of All Human Ideas, Is A History Of Irresponsible Dreams, Of Obstinacy, And Of Error. But Science Is One Of The Very Few Human Activities-perhaps The Only One-in Which Errors Are Systematically Criticized And Fairly Often, In Time, Corrected. This Is Why We Can Say That, In Science, We Often Learn From Our Mistakes, And Why We Can Speak Clearly And Sensibly About Making Progress There. In Most Other Fields Of Human Endeavour There Is Change, But Rarely Progress ... And In Most Fields We Do Not Even Know How To Evaluate Change.

In My View, Aiming At Simplicity And Lucidity Is A Moral Duty Of All Intellectuals: Lack Of Clarity Is A Sin, And Pretentiousness Is A Crime.

I See Now More Clearly Than Ever Before That Even Our Greatest Troubles Spring From Something That Is [as] Admirable And Sound As It Is Dangerous – From Our Impatience To Better The Lot Of Our Fellows.