Everything You Can Imagine, Nature Has Already

All Our Thoughts And Concepts Are Called Up By Sense-experiences And Have A Meaning Only In Reference To These Sense-experiences. On The Other Hand, However, They Are Products Of The Spontaneous Activity Of Our Minds; They Are Thus In No Wise Logical Consequences Of The Contents Of These Sense-experiences. If, Therefore, We Wish To Grasp The Essence Of A Complex Of Abstract Notions We Must For The One Part Investigate The Mutual Relationships Between The Concepts And The Assertions Made About Them; For The Other, We Must Investigate How They Are Related To The Experiences.

I Must Seem Like An Ostrich Who Forever Burries Its Head In The Relativistic Sands In Order Not To Face The Evil Quanta.

When Forced To Summarize The General Theory Of Relativity In One Sentence: Time And Space And Gravitation Have No Separate Existence From Matter.

It Is Best, It Seems To Me, To Separate One's Inner Striving From One's Trade As Far As Possible. It Is Not Good When One's Daily Break Is Tied To God's Special Blessing.

The Only Mistake In Life Is The Lesson Not Learned.