This work delves into the profound commentary of 'Allamah Tabataba'i, one of the most influential Islamic scholars, as he builds upon Mulla Sadra's philosophical framework, specifically the "Proof of the Sincere" (Burhan al-Siddiqin). Mulla Sadra, an Islamic philosopher and founder of the transcendent philosophy (al-hikmah al-muta’aliyah), presented a unique metaphysical argument that links sincere belief with the realization of God’s ultimate existence. In his footnote, 'Allamah Tabataba'i offers a deeper exposition of this argument, refining Sadra's proof with his own insights. This text is a must-read for those interested in Islamic philosophy, metaphysics, and the intellectual legacy of Sadra and Tabataba'i. It addresses key theological questions regarding the nature of faith, sincerity, and the metaphysical path to recognizing God’s reality.