The Test Of All Knowledge Is Experiment.

I Think I Can Safely Say That Nobody Understands Quantum Mechanics.

There Are Theoretical Physicists Who Imagine, Deduce, And Guess At New Laws, But Do Not Experiment; And Then There Are Experimental Physicists Who Experiment, Imagine, Deduce, And Guess.

The Most Important Thing I Found Out From My Father Is That If You Asked Any Question And Pursued It Deeply Enough, Then At The End There Was A Glorious Discovery Of A General And Beautiful Kind.

I Think It's Much More Interesting To Live Not Knowing Than To Have Answers Which Might Be Wrong.

The Difficulty Really Is Psychological And Exists In The Perpetual Torment That Results From Your Saying To Yourself, "but How Can It Be Like That?" Which Is A Reflection Of Uncontrolled But Utterly Vain Desire To See It In Terms Of Something Familiar. ... If You Will Simply Admit That Maybe Nature Does Behave Like This, You Will Find Her A Delightful, Entrancing Thing. Do Not Keep Saying To Yourself, If You Can Possible Avoid It, "but How Can It Be Like That?" Because You Will Get 'down The Drain', Into A Blind Alley From Which Nobody Has Escaped. Nobody Knows How It Can Be Like That.