A Great Thought Begins By

The Theory Must Not Contradict Empirical Facts.

A Theory Can Be Proved By Experiment; But No Path Leads From Experiment To The Birth Of A Theory.

Between The Difficulties, One Hides The Opportunity

The Aim Of Science Is, On The One Hand, As Complete A Comprehension As Possible Of The Connection Between Perceptible Experiences In Their Totality, And, On The Other Hand, The Achievement Of This Aim By Employing A Minimum Of Primary Concepts And Relations.

It Takes A Different Kind Of Thinking To Solve A Problem Than The Kind Of Thinking Which Produced The Problem.