 There are several different schools of thought with very different outlooks; however, all are accepted as correct.Modern halakhic authorities have tried to narrow the scope and diversity within kabbalah, by restricting study to certain texts, notably Zohar and the teachings of Isaac Luria as passed down through Hayyim ben Joseph Vital.However, even this qualification does little to limit the scope of understanding and expression, as included in those works are commentaries on Abulafian writings, "Sefer Yetzirah", Albotonian writings, and the "Berit Menuhah", which is known to the kabbalistic elect and which, as described more recently by Gershom Scholem, combined ecstatic with theosophical mysticism.