For the settlement of disputes among people select him who is the most distinguished of your subjects in your view. The cases (coming before him) should not vex him, disputation should not enrage him, he should not insist on any wrong point, and should not grudge accepting the truth when he perceives it; he should not lean towards greed and should not content himself with a cursory understanding ( of a matter ) without going thoroughly into it. He should be most ready to stop (to ponder) on doubtful points, most regardful of arguments, least disgusted at the quarrel of litigants, most patients at probing into matters and most fearless at the time of passing judgment. Praise should not make him vain and elation should not make him lean (to any side).
Such people are very few
53'th Letter of Nahjul Balagha.
An order to Maalik al-Ashtar from Ameer al-Mu'mineen, the Commander of the Faithful, Imam Ali ibn Abi Talib (a.s.)