What are Siddhis in Yoga and why are they irrelevant in Spirituality?

Siddhis are accomplishments of the body and energies.  These are immature and juvenile acts.  Sadhguru says all those miracles are useful and irrelevant.  Very useful!

Yin and Yang: the basis of life
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Spiritual Saviors? But there is nothing to Save!
International Yoga Day: Controversies, responses and Why Yoga?