The two main constituents of the Hindu ritual-speculative tradition, the Vedic and the Tantric, are often considered to be more or less antagonistic. The actual situation is less simple: there are resemblances, intersections and combinations, which tend to fuse both elements into a continuous tradition. The Kubjikā Upaniṣad is a unique document which illustrates this continuity. The text consists of twenty-five chapters, which have never before been edited or translated. It belongs to the corpus of the younger, so-called 'sectarian' Upaniṣads. The critical edition was...