We Do Not Know. We

In Point Of Fact, No Conclusive Disproof Of A Theory Can Ever Be Produced; For It Is Always Possible To Say That The Experimental Results Are Not Reliable Or That The Discrepancies Which Are Asserted To Exist Between The Experimental Results And The Theory Are Only Apparent And That They Will Disappear With The Advance Of Our Understanding. If You Insist On Strict Proof (or Strict Disproof) In The Empirical Sciences, You Will Never Benefit From Experience, And Never Learn From It How Wrong You Are.

Ignorance Is Not A Simple Lack Of Knowledge But An Active Aversion To Knowledge, The Refusal To Know, Issuing From Cowardice, Pride, Or Laziness Of Mind.

Every Solution Of A Problem Raises New Unsolved Problems.

No Particular Theory May Ever Be Regarded As Absolutely Certain.... No Scientific Theory Is Sacrosanct.

Rationalism Is An Attitude Of Readiness To Listen To Contrary Arguments And To Learn From Experience... Of Admitting That "i May Be Wrong And You May Be Right And, By An Effort, We May Get Nearer The Truth."