Status of Reason of Wisdom in the Deductive Manner of Shiah Jurisprudents

In order to access how to use of reason of wisdom (Dalile Aghl) in Shiah jurisprudence and its practical application، principal ideas and practices of six Shiah jurisprudents have been surveyed. They are Sheikh Toosi، Ibn Edris Helli، Mohaghegh Helli، Mohaghegh Ardebili، Molla Mohsen Pheiz Kashani، and Sheikh Ansari. This survey has been done by method of analyzing of content of principal and jurisprudential texts، and focus on deductive legal decisions. The results show that they have accepted the use of wisdom for proving the Shariah and the necessity of its obedience، and rational goodness and ugliness (Hosn o Ghobhe Aghli). They believe that all of legal statements (Khetabat Shar''ei) are understood through the reason of wisdom. The certainty of rational command is acceptable before all of the jurisprudents، but there are different opinions in achieving to the certainty; since the sentences of Shariah are based on expedients and inexpedients، and it is difficult to understand by wisdom. The reason of wisdom has been used in specification of generalities and as the principle of «Esteshab».