There is a darkness which is not darkness in itself, and that is the great light that shines forth to all and is called darkness, because it is inconceivable, because everything inconceivable is darkness for whom who can not form it, darkness, even if it were a luminous light (Sepher Ha bahir)
The Sefer ha-Bahir is a book of the Jewish Kabbalah, which is attributed to the Tannaite Nechonja ben ha-Qana, but sometimes Isaac of Akko and also Isaac the Blind are mentioned.
It may contain elements of the older Sefer Raza Rabba. In 1174, the Sefer ha-Bahir was published as a manuscript by a french cabbalist school. The book became the most important text after the Sohar.
The book consists of five sections divided into 200 short paragraphs.