Shankara commented on Krishna, on the Upanishads, on the Brahma Sutras. Ramanuja commented on the ancient enlightened people, Vallabha did the same. It has always been so in the East, because much dust gathers as time passes. Now, the Upanishads were written in a totally different world. That man has disappeared, that mind has disappeared, that world no more exists.
RajneeshI have been teaching you all the methods of meditation. You can choose any method that suits you. There are only one hundred and twelve methods; there is no possibility of adding more. It is exhaustive. All the methods possible have been explored. The simplest is witnessing.
Rajneesh