John D. Rockefeller

"Singleness of purpose is one of the chief essentials for success in life, no matter what may be one's aim."

"A friendship founded on business is better than a business founded on friendship."

"I do not think that there is any other quality so essential to success of any kind as the quality of perseverance. It overcomes almost everything, even nature."

"If you want to succeed you should strike out on new paths, rather than travel the worn paths of accepted success."

"Don't be afraid to give up the good to go for the great."