Yoga Sutras

According to Wikipedia: "e;The Yoga Sutras of Patanjali are 196 Indian sutras (aphorisms) that constitute the foundational text of Raja Yoga. Yoga is one of the six orthodox astika schools of Hindu philosophy, which, according to the Yogatattva Upanishad, is divided into four forms - Mantrayoga, Layayoga, Hathayoga and Rajayoga - the last of which is the highest (or royal) practice. Although the Yoga Sutras have become the most important text of Yoga, the opinion of most scholars is that Patanjali was not the creator of Yoga, which existed well before him, but merely a great expounder."e;