Answer
Sayyid Qutb's magnum opus,'Fi Zilal al-Quran', is a commentary on the Quran. It is considered to be one of the most important works of Islamic thought in the modern era, and has had a significant influence on the development of Islamic fundamentalism. Qutb's commentary is a comprehensive analysis of the Quran, and he uses it to argue for a return to the original teachings of Islam.