Q: Is there a difference between “unnecessary experience” and karma?
There is no such thing as unnecessary experience, nor is there anything that is not karma. That is why in Yoga Sutras 2:18, Patanjali says that the entire range of relative existence “has for its purpose (providing the purusha with) experience and liberation.” (The words in parentheses are added by the translator I. K. Taimni in his commentary The Science of Yoga.)
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