"There is nothing so useless as doing efficiently that which should not be done at all."
"Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful."
"The distance between insanity and genius is measured only by success."
"I know the price of success: dedication, hard work, and an unremitting devotion to the things you want to see happen."
"Success consists of going from failure to failure without loss of enthusiasm."