We Do Not Know Anything

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.

Our Belief In Any Particular Natural Law Cannot Have A Safer Basis Than Our Unsuccessful Critical Attempts To Refute It.

Reason Like Science, Grows By Way Of Mutual Criticism; The Only Possible Way Of Planning Its Growth Is To Develop Those Institutions That Safeguard. The Freedom Of Thought

True Ignorance Is Not The Absence Of Knowledge, But The Refusal To Acquire It.

I Don't Know Whether God Exists Or Not. ... Some Forms Of Atheism Are Arrogant And Ignorant And Should Be Rejected, But Agnosticism—to Admit That We Don't Know And To Search—is All Right. ... When I Look At What I Call The Gift Of Life, I Feel A Gratitude Which Is In Tune With Some Religious Ideas Of God. However, The Moment I Even Speak Of It, I Am Embarrassed That I May Do Something Wrong To God In Talking About God.