योगतारावली (आदि शङ्कराचार्य - अमनस्क दशा, नादानुसन्धान एवं राजयोग रहस्य सटीक)

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explain the expressions of the text with the help of the available
works on Haṭhayoga and Rājayoga, yet we do not hesitate to
declare that the significance of some of the expressions remains
still to be determined.
The work, we believe, will delight all lovers of yoga and
inspire them to run on the path of yoga with undivided
attention.
R. S. Bhattacharya