ABSTRACT
Medieval Jewish mysticism is based on earlier rabbinic speculation. Within aggadic sources the rabbis engaged in mystical reflection concerning the Biblical text. These doctrines were frequently of a secret nature; in a midrash on Genesis it is reported that these mystical traditions were repeated in a whisper so they would not be overheard by those for whom they were not intended. In their mystical reflections, the first chapter of Ezekiel played an important role in early rabbinic mysticism. In the Biblical text the divine chariot (Merkavah) is described in detail, and this Scriptural source served as the basis for mystical teaching about the nature of the Deity. According to the rabbis, the attainment of knowledge of the Merkavah was an exceedingly difficult task beset with obstacles. The Talmud relates that even learned scholars were not immune from the hazards of fire.
