BOOK: The Yoga Sutras of Patanjali, Commentary by Sri Swami Satchidananda – The Yoga Sutras of Patanjali is the primary text of Raja Yoga – the path of concentration and meditation. I first read it during my yoga teacher training and continue to reference it. The Sutras, or thought-threads, are at least 4,000 years old and cover the yogic teachings on ethics, meditation, and physical postures. They also provide guidance for dealing with situations in everyday life.