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Next comes svadhyaya or study. This means study that concerns the true Self, not merely analyzing the emotions and mind as the psychologists and psychiatrists do. Anything that will elevate your mind and remind you of your true Self should be studied: the Bhagavad Gita, the Bible, the Koran, these Yoga Sutras, or any uplifting scripture. Study
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Satchidananda (The Yoga Sutras of Patanjali—Integral Yoga Pocket Edition: Translation and Commentary by Sri Swami Satchidananda)