The Only Source Of Knowledge Is Experience.

The Only Mistake In Life Is The Lesson Not Learned.

One Can Only Continue To Expect To Be Read If One Omits Everything That Is Unimportant.

The Belief In An External World Independent Of The Perceiving Subject Is The Basis Of All Natural Science. Since, However, Sense Perception Only Gives Information Of This External World Or Of "physical Reality" Indirectly, We Can Only Grasp The Latter By Speculative Means. It Follows From This That Our Notions Of Physical Reality Can Never Be Final. We Must Always Be Ready To Change These Notions - That Is To Say, The Axiomatic Basis Of Physics - In Order To Do Justice To Perceived Facts In The Most Perfect Way.

To Understand The World One Must Not Be Worrying About One's Self.

Often In Evolutionary Processes A Species Must Adapt To New Conditions In Order To Survive. Today The Atomic Bomb Has Altered Profoundly The Nature Of The World As We Know It, And The Human Race Consequently Finds Itself In A New Habitat To Which It Must Adapt Its Thinking.