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

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

无论一个人的目标是什么，目标专一是人生成功的主要要素之一。

-- John Davison Rockefeller 约翰·戴维斯·洛克菲勒