"If you must judge, judge wisely"

The motto written in Arabic and emblazoned in gold on the wall of a newly refurbished Iraqi court was seen a few days ago in a special Foxnews special of the upcoming Saddam trial. The pithy and wise motto says "If you must judge, judge wisely." I had assumed that this was some quote found in the Koran but after some extensive searching I couldn't find it. Perhaps under a different wording? Can anybody provide a passage quote? It would make sense coming from the Koran to use such quotes as some of the U.S. courts do the same. Regardless, that pithy quote reminds me of a statue of a blindfolded lady holding up a gravity scale seen in U.S. courts which signifies a "balanced" judgement without bias.