. . . You must purify your heart . . .

. . . . . You must purify your heart by purging it of any heretical innovation [bid’a], for the doctrine [I’tiqad] of the people [of the Lord] is the doctrine of the Prophets [nabiyyin], the Messengers [mursalin], and the champions of the truth [siddiqin]. Theirs is the school [madhhab] to which they adhere [in respect of religious tenets and practices], the school of the righteous predecessors. They would never make a claim that could not be substantiated, and whenever they do make a claim, it is supported by the testimony of two impeccable witnesses, whose honorable status is definitely beyond suspicion, namely, the Book of Allah and the Sunna of His Messanger. . . . . .

Taken from “The Fortieth Discourse”, given in the year A.H.546/1152 C.E.by Sheik' Abd Al-Qadir Al-Jilani, of the book titled, “The Removal of Cares (Jala Al-Khawatir).