And it is unnecessary to mention the Rabbi Avraham ben David (Raavad), the early commentator of the book Yatzira, and among our early Ashkenazi sages, there is the Chassid (pious individual) who authored the book Rochach (Rokeach). And among the sages of Spain after the Ramban (Nachmanides), there is the Rashba (Rabbi Shlomo ben Aderet) and all his students who upheld it. It is certainly the wisdom of the Divine that the Talmudic sages hinted at in the Mishnah and Gemara, and it is mentioned in the name of Ma'aseh Merkavah and Ma'aseh Bereishit (Work of the Chariot and Work of Creation).