Ibn Taymiyyah on Tasawwuf

“Ibn Taymiyyah said in volume 10 of his majmu’ page 516-17, speaking of the adherence of the sufiyya to the kitab and sunnah:
‘As for those who are upright (mustaqimun) from the salikeen (spiritual wayfarers), such as the majority of the mashayikh as-salaf, such as al-Fudayl ibn Iyad, Ibrahim bin Adham, Abu Sulayman ad-Darani, Maruf al-Karkhi, al-Sari al-Saqati, al-Junayd bin Muhammad, and others among the early generations (al-mustaqdimeen), and such as sheikh Abdul Qadir (al-Jilani), and sheikh Hammad, and sheikh Abi al-Bayan, and others among the latter generations (muta’akhireen), they did not allow for the spiritual wayfarer to go outside of the realm of the Divine command and prohibition found in the Sharieen (Sharia), even if he flew in the air and walked on water. Rather, [they would insist] that he do that which is commanded and abstain from that which is prohibited until the day he dies. This is the truth that is proven in the Kitab and sunnah, and ijma’ of the salaf, and this is found often in their words.’