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The Physicist, In His Study Of Natural Phenomena, Has Two Methods Of Making Progress: (1) The Method Of Experiment And Observation, And (2) The Method Of Mathematical Reasoning. The Former Is Just The Collection Of Selected Data; The Latter Enables One To Infer Results About Experiments That Have Not Been Performed. There Is No Logical Reason Why The Second Method Should Be Possible At All, But One Has Found In Practice That It Does Work And Meets With Reasonable Success.

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.

Hopes Are Always Accompanied By Fears, And, In Scientific Research, The Fears Are Liable To Become Dominant.

One Could Perhaps Describe The Situation By Saying That God Is A Mathematician Of A Very High Order, And He Used Very Advanced Mathematics In Constructing The Universe.

Quantum Mechanics Has Explained All Of Chemistry And Most Of Physics.