Inferential method of Quranic commentary has been regarded a kind of commentary along with other methods such as those of Quran to Quran and Quran to tradition. The holy Quran includes reasonable proofs and in many verses call up us to think, reasoning and meditation. Using the power of reason and reasonable tokens in Quranic commentary is rooted in the tradition of the Prophet (s) and His household. Imam Sadeq (a) as a member of the household of the Prophet has applied this method in commentary in many cases.