# Quotes From Rockefeller > "A friendship founded on business is better than a business founded on friendship." "Do not many of us who fail to achieve big things fail because we lack concentration - the art of concentrating the mind on the thing to be done at the proper time and to the exclusion of everything else?" "Don't work after 50 because money won't let you know yourself. Spend time wisely, then you will be extended. "The road to happiness lies in two simple principles. Find what it is that interests you and that you can do well, and when you find it, put your whole soul into it with every bit of energy and ambition and natural ability you have." JOHN D. ROCKEFELLER An American business magnate, 1839 - 1937