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The Yoga of action, leading to union with the soul is fiery aspiration, spiritual reading and devotion to Ishvara.

Alice Bailey, Patanjali (2012). “The Light of the Soul: Paraphrase of the Yoga Sutras of Pantanjali”, p.112, Lucis Publishing Companies
The Yoga of action, leading to union with the soul is fiery aspiration, spiritual reading and devotion to Ishvara.