The Principle of Divine Grace (qāʿidat al-luṭf) is a pivotal theological rule in the ʿAdlīyyah (justice-oriented) theology, employed to substantiate core religious doctrines such as the obligation of religious duties, the necessity of prophetic missions, the infallibility of prophets, and the obligation of appointing an Imam. This study examines how ʿAdlīyyah exegetes applied this principle in their Qur'anic commentaries, focusing on its two primary dimensions: ontological and exemplificatory. Ontologically, the commentaries address themes such as the existence of Divine Grace (wujūd al-luṭf), its obligatory nature (wujūb al-luṭf), its scope (ḥudūd al-luṭf), its relationship with free will (ikhtiyār) and divine power (qudrah), and the interplay between divine punishment and grace. Exemplificatory discussions focus on Qur'anic concepts like reward and punishment, prophets, miracles, the Quran’s inimitability, infallibility, angels, prayer, and trials. The findings demonstrate that ʿAdlīyyah exegetes utilized the Principle of Divine Grace to elucidate the wisdom underlying Qur'anic injunctions, emphasizing its role in reconciling divine justice with human agency.