“The key to every man is his thought. Sturdy and defiant though he look he has a helm which he obeys, which is the idea after which all his facts are classified. He can only be reformed by showing him a new idea which commands his own.” -Emerson.  

“All truly wise thoughts have been thought already thousands of times; but to make them really ours we must think them over again honestly till they take root in our personal expression.” -Goethe.  

“All that a man is outwardly is but the expression and completion of his inward thought. To work effectively he must think clearly. To act nobly he must think nobly.” -Channing.  

“Great men are they who see that spirituality is stronger than any material force; that thoughts rule the world.” -Emerson.