....It wasn’t until about 600 BCE, just before the time of the Buddha, that Upaniṣadic ideas were condensed into the Sāṃkhya system. And it’s upon the Sāṃkhya system that the different systems of yoga, those that recognised Vedic authority (Vedanta), and others that do not - Buddhism, Jainism and Charvaka-materialism, - base their arguments.

....My travels take me along the Ganga, to Manikarnika burning Ghat, the Aghori ashram, and along the Panchakroshi pilgrimage circuit to undercover a sacred city in the shape of a comic mandala.