To understand the titer, notice the following narration:
Once Imam SÄdiq (pbuh) asked âHishÄm ibn កakamâ,
âTell me how you debate Amroo ibnÊ¿Ubayd?â
HishÄm reacted,
âI am ashamed of you,
and I canât speak by your greatness !!â
The Imam (pbuh) stated,
âYou must promptly obey, whenever we give you a command.â
HishÄm said:
Once I heard, Amroo ibnʿUbayd collected a group in [the old] mosque Baṣrah.
And he started distracting them from wilÄyah [Imamate]
So I set off Baá¹£rah, in order to debate with him.
To do this, first I attended in his teaching session and listened to his words.
[There], the people started gazing at me.
Finally, I broke the silence and asked him,
âO, the scholar! I am a stranger [here]!
Will you let me ask you some questions?â
Amroo said, âNo problem! Ask meâ
HishÄm: âDo you have eyes?â
Amroo: âMy son! What a question it is!
Why do you ask about something you can see?â
HishÄm: âMy questions are of this type!â
‘Amr: [Well] no problem ask me,
though your questions are stupid!!
HishÄm: âNow, answer to my questions. Do you have eyes?â
‘Amr: âYes!â
HishÄm: âHow do you use them?â
‘Amr: âI can see the people by them,
and make things and colors apart.â
HishÄm: âDo you have a nose?â
In the name of God, the Lord of Merci, the Compassionate
‘Amr answered, âYes, I do.â
HishÄm asked, âWhat is its usage for you?â
‘Amr answered, âI can smell odors.â
HishÄm asked, âDo you have a mouth?â
‘Amr answered, âYes!â
HishÄm asked, âWhat do you use it for?”
‘Amr said, âI use it to taste foods.â
HishÄm asked, âDo you have ears, as well?â
‘Amr answered, âYes, I do.â
HishÄm asked, âWhat do you use your ears for?â
‘Amr said, “I use it to hear sounds.”
HishÄm asked, âAnd finally, do you have intellect as well?â
‘Amr answered, âYes!â
In the Name of God, the Compassionate, the Merciful.
HishÄm: What are the heart and wisdom for?
‘Amr: I use them (The heart and wisdom) to detect errors, if those senses make mistakes,
HishÄm: Are not these senses independent of the heart?
‘Amr: No!
HishÄm: How does it come while all your organs are healthy?
‘Amr: O, my son!
Sometimes body organs make mistakes for example; in tasting, seeing, smelling or hearing.
There one should refer to the heart, to save from doubt and doubles.
HishÄm: So God has gifted the heart to prevent the mistakes of the organs, hasnât he?
‘Amr: Yes!
HishÄm: O, ‘Aba Marwan (Amrâs nickname)! God has gifted people the heart, as the leader and Imam to prevent the errors of the five senses.
[Now] has not God appointed Imams and leaders to the whole human society, to avoid errors, mistakes and intellectual deviations?!
‘Amr became silence, while he was stunned and unable to answer! [1]
Yes! As the heart coordinates all organs of the body and it is the center of management and the power processor of the body,
Imam manages the affairs on behalf of God, and collects all the dispersed parts of the universe. Imam also takes care of the affairs of God and disposes all the dispersed parts of the universe.
In the prayer of Nudba, it reads: أÙÛÙÙÙ Ù ÙØ€ÙÙÙÙÙÙ ØŽÙÙ ÙÙ٠اÙصÙÙÙاØÙ Ù٠اÙرÙÙضاØ
It means:
Where is the one reunifying the dispersed parts of uprightness and contentment?
1-          Uṣūl al-KÄfÄ«,  Vol.1, P. 171-169