What is Yoga?

Herbert Günther wrote in his "What is that which is called Yoga?":

"The Indic word yoga has become a household word in any Western language where, as in its original Indian cultural context, it has become a cover term for a variety of disciplines and techniques, each claiming to be the last word. Given this state of affairs the question "What is that which is called Yoga" is still pertinent and must be dealt with in its historical context."

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