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

Entrepreneurs
John D. Rockefeller
John D. Rockefeller (1839-1937) founded Standard Oil in 1870 and controlled 90% of U.S. refining at its peak. After becoming America's first billionaire, he pioneered systematic philanthropy in medicine and education.
View this figure's profile
John D. Rockefeller's Other Quotes
Related Quotes
Make every detail perfect and limit the number of details to perfect.
-- Jack Dorsey
I'm convinced that about half of what separates successful entrepreneurs from unsuccessful ones is pure perseverance.
-- Steve Jobs
Do not think about a hundred things at once; think a hundred times about one thing.
-- Sakichi Toyoda
I constantly see people rise in life who are not the smartest, sometimes not even the most diligent, but they are learning machines.
-- Charlie Munger
The individual investor should act consistently as an investor and not as a speculator.
-- Benjamin Graham
The secret of success is to be ready when your opportunity comes.
-- Li Ka-shing