“Energy cannot be created or destroyed, it can only be changed from one form to another.”

“The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.”

“One cannot alter a condition with the same mind set that created it in the first place.”

“Creating a new theory is not like destroying an old barn and erecting a skyscraper in its place. It is rather like climbing a mountain, gaining new and wider views, discovering unexpected connections between our starting points and its rich environment. But the point from which we started out still exists and can be seen, although it appears smaller and forms a tiny part of our broad view gained by the mastery of the obstacles on our adventurous way up.”

“Peace cannot be kept by force; it can only be achieved by understanding.”

“Problems cannot be solved with the same mind set that created them.”

“Knowledge exists in two forms - lifeless, stored in books, and alive, in the consciousness of men. The second form of existence is after all the essential one; the first, indispensable as it may be, occupies only an inferior position.”