A Physical Law Must Possess Mathematical Beauty.

The Fundamental Laws Necessary For The Mathematical Treatment Of A Large Part Of Physics And The Whole Of Chemistry Are Thus Completely Known, And The Difficulty Lies Only In The Fact That Application Of These Laws Leads To Equations That Are Too Complex To Be Solved.

I Think It Is A Peculiarity Of Myself That I Like To Play About With Equations, Just Looking For Beautiful Mathematical Relations Which Maybe Don't Have Any Physical Meaning At All. Sometimes They Do. At Age 60.

The Research Worker, In His Efforts To Express The Fundamental Laws Of Nature In Mathematical Form, Should Strive Mainly For Mathematical Beauty. He Should Take Simplicity Into Consideration In A Subordinate Way To Beauty ... It Often Happens That The Requirements Of Simplicity And Beauty Are The Same, But Where They Clash, The Latter Must Take Precedence.

I Found The Best Ideas Usually Came, Not When One Was Actively Striving For Them, But When One Was In A More Relaxed State… I Used To Take Long Solitary Walks On Sundays, During Which I Tended To Review The Current Situation In A Leisurely Way. Such Occasions Often Proved Fruitful, Even Though (or Perhaps, Because) The Primary Purpose Of The Walk Was Relaxation And Not Research.

In Science One Tries To Tell People, In Such A Way As To Be Understood By Everyone, Something That No One Ever Knew Before. But In Poetry, It Is The Exact Opposite.