The Word Reality Frightens Me.

For The Truth Of The Conclusions Of Physical Science, Observation Is The Supreme Court Of Appeal.

Proof Is An Idol Before Which The Mathematician Tortures Himself.

I Ask You To Look Both Ways. For The Road To A Knowledge Of The Stars Leads Through The Atom; And Important Knowledge Of The Atom Has Been Reached Through The Stars.

The Helium Which We Handle Must Have Been Put Together At Some Time And Some Place. We Do Not Argue With The Critic Who Urges That The Stars Are Not Hot Enough For This Process; We Tell Him To Go And Find A Hotter Place.

But It Is Necessary To Insist More Strongly Than Usual That What I Am Putting Before You Is A Model-the Bohr Model Atom-because Later I Shall Take You To A Profounder Level Of Representation In Which The Electron Instead Of Being Confined To A Particular Locality Is Distributed In A Sort Of Probability Haze All Over The Atom.