Ibn Taymiyyah states:“If we assume that someone narrated the view of the salaf but what he narrated is far removed from what the view of the salaf actually is, then he has little knowledge of the view of the salaf, such as Abu’l-Ma’aali, Abu Hamid al-Ghazali, Ibn al-Khateeb and the like, who did not have enough knowledge of hadith to qualify them as ordinary scholars of hadith, let alone as prominent scholars in that field. For none of these people had any knowledge of al-Bukhari and Muslim and their hadiths, apart from what they heard, which is similar to the situation of the ordinary Muslim, who cannot distinguish between a hadiith which is regarded as sahih and mutawatir according to the scholars of hadith, and a hadith which is fabricated and false. Their books bear witness to that, for they contain strange things and most of these scholars of ‘ilm al-kalam (science of kalam) and Sufis who have drifted away from the path of the salaf admit that, either at the time of death or before death. There are many such well-known stories. This Abu Hamid al-Ghazali, despite his brilliance, his devotion to Allah, his knowledge of kalam and philosophy, his asceticism and spiritual practices and his Sufism, ended up in a state of confusion and resorted to the path of those who claim to find out things through dreams and spiritual methods."
Abu Hamid Al-Ghazali (450-505 AH/1058-1111 AD) [aka: Al-Ghazali, Algazel] is one of the great jurists, theologians and mystics of the 12th Century. He wrote on a wide range of topics including jurisprudence, theology, mysticism and philosophy.