The Tasnim Method in Interpreting the Quran is a comprehensive ijtihadic method with an emphasis on "interpreting the Quran by the Quran" with a moderate approach, meaning maximum benefit from the verses of the Quran, which is achieved by the intellect's discernment of the evidence and clues of the verse or other verses and their analysis and conclusion. In this case, the intellect only plays the role of a "lamp" and a tool. Therefore, Ayatollah Javadi Amoli makes a eloquent effort to benefit from it in his valuable Tasnim interpretation. The cognitive outcome of applying this role is to deepen and expand Quranic knowledge and avoid incorrect or incomplete and superficial understanding. The present article, written using a descriptive-analytical method, explains the essence of Misbahi's intellect and comprehensive ijtihadic interpretation, as well as the interpretation of the Quran by the Quran, and presents some of its Quranic and narrational evidence. It then points out fifteen functions of the application of Misbahi's intellect in Tasnim interpretation, especially with an emphasis on the interpretation of the Quran by the Quran: accuracy in the meaning of words, attention to the types of signification of the signified and non-conformity, analysis and explanation of the contents, interpretation of verses and reference of similarities to certainties, removal of apparent contradictions of verses and having a comprehensive view, general assignment, absolute restriction, consideration of key verses, separation of concept from instance, attention to breadth and inclusiveness, discovery of cause, recognition of allegory from limitation and determination, utilization of the grammatical message from descriptive expression, utilization of verses in confirming interpretive narrations, utilization of verses in criticizing interpretive narrations.