Al-Fawz al-Kabir fi Usul at-Tafsir, or, The Great Victory on Qur'anic Hermeneutics is a manual of the principles and subtleties of Quranic tafsir. In it, the author outlines the five fundamental sciences that the Qur'an contains: the science of judgements, reminding others of the Favors of Allah, the Days of Allah, Life after Death, and particularly, the science of polemics. He also reviews the other sciences of tafsir such as the circumstances of revelation (asbab an-nuzul), abrogating and abrogated ayahs (an-nasikh wal-mansukh), and the unusual words and phrases of the Qur'an (gharaib al-Qur'an), before concluding the book by looking at the extraordinary and miraculous aspects of the Noble Book, and a final chapter on the meanings of the letters of the Arabic alphabet.