Imagination Is More Important Than Knowledge.

Science Will Stagnate If It Is Made To Serve Practical Goals.

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.

Feeling And Longing Are The Motive Forces Behind All Human Endeavor And Human Creations.

It Stands To The Everlasting Credit Of Science That By Acting On The Human Mind It Has Overcome Man's Insecurity Before Himself And Before Nature.

Man Owes His Strength In The Struggle For Existence To The Fact That He Is A Social Animal.