Once in a famous trial, when Mr. Henry Ford was accused of being ignorant, and was subject to cross examination by a lawyer to prove that he was indeed ignorant. After a series of multiple question thrown at him he simply responded with,

“Tell me why I should clutter my mind with general knowledge, for the purpose of being able to answer questions, when I have men (people) around me who can supply any knowledge I require?” 

That counter question was enough to prove Mr. Ford’s point; Most successful people are those who can successfully delegate work to specialists in their respective field.