SUBJECT AND OBJECTIVES : Companying with revelation and other human faculties like sense and heart, Intellect is the perceptive faculty as one of the most significant fundaments of human Ma'rifat (recognition). It is important to know the position of Intellect in the epistemic geometry of Islam, especially Islamic ethics which lead human truth. In order to realize Intellect and its position among fundamentals of epistemology, the view of some precedent scholars like Sheikh Saduq is prominent since the proximity of his age to the presence of infallible Imams and finding minor occultation era. METHOD AND FINDING : Aiding a descriptive-analytical method, we seek for the position of intellect as one of epistemological fundamentals of ethics and their rank of influence on ethical Ma'rifat based on theological thoughts of Sheikh Saduq. We have defined Intellect from the perspective of epistemology as the source of knowledge. Then, we have dealt with the types of Intellect, including theoretical and practical ones, and finding the particular type considered in epistemology. CONCLUSION : Even though, Sheikh Saduq is counted as a textualist thinker but intellect in his thought is considered as an independent source in the scope of intellectual problems, which authenticates the other sources of recognition. Intellect is also mentioned as the primary source of recognition, and in company with revelation is known as the main causes of recognition.
