The language of the Quran, with its unique rhetorical and intertextual features, has provided a dynamic platform for mystical interpretation in Shia and Sunni interpretations, but theological and methodological differences between these two schools have created challenges in the esoteric understanding of the verses. Aiming to examine the role of intertextual connections and Quranic rhetoric in the richness of mystical interpretations, this study conducts a comparative analysis of prominent interpretations of the two sects and raises the question of how these elements deepen the meanings in the verses and what similarities and differences exist in these approaches. By adopting a qualitative approach and utilizing the comparative analysis method, this study examines authoritative Shia interpretations such as al-Safi and al-Mizan and Sunni interpretations such as al-Kashf and Mafatih al-Ghayb and analyzes key verses. Data were collected and evaluated through content analysis of interpretive texts and related narrations. The findings show that mystical interpretation in Shiite interpretations, relying on the teachings of the Ahl al-Bayt and the mediating role of the Imams, leads to a systematic and guardian understanding of the verses, such as the verse of light being interpreted as the manifestation of guardianship in the heart of the believer. In contrast, Sunni interpretations, emphasizing mystical intuition and rhetorical analysis, link meanings to the individual experience of the mystics, such as the interpretation of the verse of Ar-Rahman as Fana fi Allah.