Story: Why we need an imam?

Once in a mosque in Iraq there was a mancalled Amr bin Ubayd who told people that he did not believe in the need of A-immahA young student of Imam Ja'far as-Sadiq (a.s.), whose name was Hisham,asked Amr that if he was so sure that there was no need of an Imam, couldhe please answer some of his questions. Amr agreed.Hisham: “Do you have eyes?”Amr: “ Yes, of course I have eyes.”Hisham: “What is the use of your eyes?”Amr: “They are to see with.”Hisham: “Do you have ears?”Amr: “Yes, I have ears.”Hisham: “What is the use of your ears?”Amr: “They are to hear with.”Hisham: “What about your nose, your mouth?Amr: Thought what foolish questions he was being asked.Hisham: “Do you have a brain?”Amr : “yes, I have a brain.”Hisham: “Of what use is the brain to you?”Amr: “It is with the brain that I am able to understand the informationreceived by all the other organs.”Hisham: “ Does that mean that although all the organs that you have(eyes,ears, nose, mouth) are healthy, they still cannot work without the brain.Amr: “Yes”Hisham: “So, if Allah has made a brain to guide the organs in the body,DON’T YOU THINK THAT ALLAH WOULD LEAVE A GUIDE (IMAM) FORALL THE PEOPLE OF THE WORLD?”Amr could not reply!