The tension between desire to cleanse Islam of heresy and fear of inaccurate takfir is suggested in the writings of some of the leading Islamic scholars. Al-Ghazali "is often credited with having persuaded theologians", in his "Fayal al-tafriqa", "that takfir is not a fruitful path and that utmost caution is to taken in applying it", but in other writing he made sure to condemn as beyond the pale of Islam "philosophers and Ismaili esotericists". Ibn Hazm and Ibn Taymiyyah also "warned against unbridled takfir" while takfiring "specific categories" of theological opponents as "unbelievers".