Looking At Something Changes It.

Many People Will Tell You That An Expert Is Someone Who Knows A Great Deal About The Subject. To This I Would Object That One Can Never Know Much About Any Subject. I Would Much Prefer The Following Definition: An Expert Is Someone Who Knows Some Of The Worst Mistakes That Can Be Made In The Subject, And How To Avoid Them.

In My Paper The Fact The Xy Was Not Equal To Yx Was Very Disagreeable To Me. I Felt This Was The Only Point Of Difficulty In The Whole Scheme...and I Was Not Able To Solve It.

[t]he Atoms Or Elementary Particles Themselves Are Not Real; They Form A World Of Potentialities Or Possibilities Rather Than One Of Things Or Facts.

What We Observe Is Not Nature Itself But Nature Exposed To Our Method Of Questioning. Our Scientific Work In Physics Consists In Asking Questions About Nature In The Language That We Possess And Trying To Get An Answer From Experiment By The Means That Are At Our Disposal.

It Seems Sensible To Discard All Hope Of Observing Hitherto Unobservable Quantities, Such As The Position And Period Of The Electron... Instead It Seems More Reasonable To Try To Establish A Theoretical Quantum Mechanics, Analogous To Classical Mechanics, But In Which Only Relations Between Observable Quantities Occur.