Yoga Sutras of Patanjali

In Indian philosophy, Yoga is the name of one of the six orthodox philosophical schools. The Yoga philosophical system is closely allied with the Samkhya school. The Yoga school as expounded by Patanjali accepts the Samkhya psychology and metaphysics, but is more theistic than the Samkhya, as evidenced by the addition of a divine entity to the Samkhya's twenty-five elements of reality. The parallels between Yoga and Samkhya were so close that Max Müller says that "the two philosophies were in popular parlance distinguished from each other as Samkhya with and Samkhya without a Lord...." The intimate relationship between Samkhya and Yoga is explained by Heinrich Zimmer:

The sage Patanjali is regarded as the founder of the formal Yoga philosophy. The Yoga Sutras of Patanjali are ascribed to Patanjali, who, may have been, as Max Müller explains, "the author or representative of the Yoga-philosophy without being necessarily the author of the Sutras." Indologist Axel Michaels is dismissive of claims that the work was written by Patanjali, characterizing it instead as a collection of fragments and traditions of texts stemming from the second or third century. Gavin Flood cites a wider period of uncertainty for the composition, between 100 BCE and 500 CE.

Patanjali's yoga is known as Raja yoga, which is a system for control of the mind. Patanjali defines the word "yoga" in his second sutra, which is the definitional sutra for his entire work:

This terse definition hinges on the meaning of three Sanskrit terms. I. K. Taimni translates it as "Yoga is the inhibition (nirodhaḥ) of the modifications (vṛtti) of the mind (citta)". Swami Vivekananda translates the sutra as "Yoga is restraining the mind-stuff (Citta) from taking various forms (Vrittis)." Gavin Flood translates the sutra as "yoga is the cessation of mental fluctuations".

A sculpture of a Hindu yogi in the Birla Mandir, Delhi

Patanjali's writing also became the basis for a system referred to it as "Ashtanga Yoga" ("Eight-Limbed Yoga"). This eight-limbed concept derived from the 29^th Sutra of the 2^nd book became a feature of Raja yoga, and is a core characteristic of practically every Raja yoga variation taught today.The Eight Limbs of yoga practice are:

(1) Yama (The five "abstentions"): violence, lying, theft, (illicit) sex, and possessions

(2) Niyama (The five "observances"): purity, contentment, austerities, study, and surrender to god

(3) Asana: Literally means "seat", and in Patanjali's Sutras refers to seated positions used for meditation. Later, with the rise of Hatha yoga, asana came to refer to all the "postures"

(4) Pranayama ("Life Force Control"): Control of prāna, life force, or vital energy, particularly, the breath

(5) Pratyahara ("Abstraction"): Reversal of the sense organs

(6) Dharana ("Concentration"): Fixing the attention on a single object

(7) Dhyana ("Meditation"): Intense contemplation of the nature of the object of meditation

(8) Samadhi ("Liberation"): merging consciousness with the object of meditation

It details every aspect of the meditative process, and the preparation for it. The book is available in as many as 40 English translations, both in-print and on-line.

Hatha Yoga Pradipika

Hatha Yoga is a particular system of Yoga described by Yogi Swatmarama, a yogic sage of the 15th century in India, and compiler of the Hatha Yoga Pradipika. Hatha Yoga is a development of — but also differs substantially from — the Raja Yoga of Patanjali, in that it focuses on shatkarma, the purification of the physical as leading to the purification of the mind (ha) and prana, or vital energy (tha). In contrast, the Raja Yoga posited by Patanjali begins with a purification of the mind (yamas) and spirit (niyamas), then comes to the body via asana (body postures) and pranayama (breath). Hatha yoga contains substantial tantric influence, and marks the first point at which chakras and kundalini were introduced into the yogic canon. Compared to the seated asanas of Patanjali's Raja yoga which were seen largely as a means of preparing for meditation, it also marks the development of asanas as full body 'postures' in the modern sense.

Hatha Yoga in its many modern variations is the style that most people actually associate with the word "Yoga" today. Because its emphasis is on the body through asana and pranayama practice, many western students are satisfied with the physical health and vitality it develops and are not interested in the other six limbs of the complete Hatha yoga teaching, or with the even older Raja Yoga tradition it is based on.