The path of the Sufis is built on the Quran and the Sunna, and is based on living according to the morals of the prophets and the purified ones. It may not be blamed, unless it violates an explicit statement from the Quran, sunna, or ijma. If it does not contravene any of these sources, then no pretext remains for condemning it, except one's own low opinion of others, or interpreting what they do as ostentation, which is unlawful. No-one denies the states of the Sufis except someone ignorant of the way they are.' Sha'rani, al-Tabaqat al-Kubra (Cairo, 1374), I, 4