While most of the works on which al-Majlisī drew are available today in printed editions, some are still known chiefly through quotations in the Biḥār. al-Majlisī always identifies the source of each passage in his work, whether it was written by himself or copied from an earlier authority. Although al-Majlisī tried to be comprehensive, there are some texts which he was able to use only partially or not at all, as he had obtained them while the work was already in progress. He intended to incorporate the missing material in a supplement (to be entitled Mustadrak al-Biḥār), but he did not live to write it. Furthermore, in conformity with his stated views, al-Majlisī refrained from using texts with a Sufi or a philosophical bias, thus excluding from the Biḥār a major component of the Shiʿī literary tradition. He did however, cite Sunni sources for lexicographical or polemical purposes.