As I read and ponder, I believe this elegant quote has often been attributed to Henry Ford: 

"I am not the smartest, but I surround myself with competent people." 

Just sharing from another perspective, David Ogilvy, widely revered as a founding father of modern advertising is credited with the following: 

'If you ever find a man who is better than you are - hire him. If necessary, pay him more than you would pay yourself.'' 

He is also reputed to have once presented each of his board directors with a set of Russian dolls. When they opened the dolls, the smallest had a piece of folded paper inside on which Ogilvy had written: 

''If you always hire people who are smaller than you, we shall become a company of dwarfs. 

If, on the other hand, you always hire people who are bigger than you, we shall become a company of giants.''