A Model Should Be As Simple As

The Theoretical Idea ... Does Not Arise Apart From And Independent Of Experience; Nor Can It Be Derived From Experience By A Purely Logical Procedure. It Is Produced By A Creative Act. Once A Theoretical Idea Has Been Acquired, One Does Well To Hold Fast To It Until It Leads To An Untenable Conclusion.

Real Sign Of Intelligence Isn't Knoweldge, It's Imagination

A Theory Is The More Impressive The Greater The Simplicity Of Its Premises Is, The More Different Kinds Of Things It Relates, And The More Extended Its Area Of Applicability.

In Scientific Thinking Are Always Present Elements Of Poetry. Science And Music Requires A Thought Homogeneous.

You Cannot Prepare For War And Peace At The Same Time.