Yoga (philosophy)

Yoga philosophy is one of the six major important schools of Hindu philosophy, though it is only at the end of the first millennium CE that Yoga is mentioned as a separate school of thought in Indian texts, distinct from Samkhya. Ancient, medieval and modern literature often simply call Yoga philosophy Yoga. A systematic collection of ideas of Yoga is found in the Yoga Sutras of Patanjali, a key text of Yoga which has influenced all other schools of Indian philosophy.
The metaphysics of Yoga is Samkhya's dualism, in which the universe is conceptualized as composed of two realities: Puruṣa (witness-consciousness) and Prakṛti (nature). Jiva (a living being) is considered as a state in which puruṣa is bonded to Prakṛti in some form, in various permutations and combinations of various elements, senses, feelings, activity and mind. During the state of imbalance or ignorance, one or more constituents overwhelm the others, creating a form of bondage. The end of this bondage is called liberation, or mokṣa, by both the Yoga and Samkhya schools of Hinduism, and can be attained by insight and self-restraint.
The ethical theory of Yoga philosophy is based on Yamas and Niyama, as well as elements of the Guṇa theory of Samkhya. The epistemology of Yoga philosophy, like the Sāmkhya school, relies on three of six Pramanas as the means of gaining reliable knowledge. These include Pratyakṣa (perception), Anumāṇa (inference) and Sabda (Āptavacana, word/testimony of reliable sources). Yoga philosophy differs from the closely related non-theistic/atheistic Samkhya school by incorporating the concept of a "personal, yet essentially inactive, deity" or "personal god" (Ishvara).
Yoga as a separate school of thought is mentioned in Indian texts from the end of the 1st millennium CE. A collection of practices and some ideas of the Yoga school of Hinduism is found in the Yoga Sutras of Patanjali. After its circulation in the first half of the 1st millennium CE, many Indian scholars reviewed it, then published their Bhāṣya (notes and commentary) on it. The commentary by Vyasa may have been written by Patanjali himself, forming an integrated text called the Pātañjalayogaśāstra ("The Treatise on Yoga of Patañjali"). Yoga as a separate school of philosophy has been included as one of the six orthodox schools in medieval era Indian texts; the other schools are Samkhya, Nyaya, Vaisheshika, Mimamsa and Vedanta. According to Bryant,
There are numerous parallels in the concepts in the Samkhya school of Hinduism, Yoga and various strands of Buddhism, particularly from the 2nd century BCE to the 1st century AD, notes Larson,and Patanjali's Yoga Sutras are a conflation of these three traditions. From the Samkhya school of Hinduism, the Yoga Sutras adopt the "reflective discernment" (adhyavasaya) of prakrti and purusa (dualism), its metaphysical rationalism, as well its three epistemic methods to gaining reliable knowledge. From the Buddhist practice of nirodhasamadhi, argues Larson, the Yoga Sutras adopt the pursuit of an altered state of awareness, but unlike Buddhism, which believes that there is no fixed self, Yoga is physicalist like Samkhya in believing that each individual has a self and soul. The third concept that the Yoga Sutras synthesize into its philosophy is the ancient ascetic traditions of isolation, meditation and introspection.
Yoga-philosophy is Samkhya. In both, the foundational concepts include two realities: Purusha and Prakriti. The Purusha is defined as that reality which is pure consciousness and is untouched by thoughts or qualities. The Prakriti is the empirical, phenomenal reality which includes matter and also mind, sensory organs and the sense of identity (self, soul). A living being is held in both schools to be the union of matter and mind. The Yoga school differs from the Samkhya school in its views on the ontology of Purusha, on axiology and on soteriology.
The metaphysics of Yoga-Samkhya is a form of dualism. It considers consciousness and matter, self/soul and body as two different realities.
The Samkhya-Yoga system espouses dualism between consciousness and matter by postulating two "irreducible, innate and independent realities: Purusha and Prakriti. While the Prakriti is a single entity, the Samkhya-Yoga schools admit a plurality of the Puruṣas in this world. Unintelligent, unmanifest, uncaused, ever-active, imperceptible and eternal Prakriti is alone the final source of the world of objects. The Puruṣa is considered as the conscious principle, a passive enjoyer (bhokta) and the Prakriti is the enjoyed (bhogya). Samkhya-Yoga believes that the Puruṣa cannot be regarded as the source of inanimate world, because an intelligent principle cannot transform itself into the unconscious world. This metaphysics is a pluralistic spiritualism, a form of realism built on the foundation of dualism.
Yoga-philosophy adopts the theory of Guṇa from Samkhya. Guṇas theory states that three gunas (innate tendency, attributes) are present in different proportions in all beings, and these three are sattva guna (goodness, constructive, harmonious), rajas guna (passion, active, confused), and tamas guna (darkness, destructive, chaotic). These three are present in every being but in different proportions, and the fundamental nature and psychological dispositions of beings is a consequence of the relative proportion of these three gunas. When sattva guna predominates an individual, the qualities of lucidity, wisdom, constructiveness, harmonious, and peacefulness manifest themselves; when rajas is predominant, attachment, craving, passion-driven activity and restlessness manifest; and when tamas predominates in an individual, ignorance, delusion, destructive behavior, lethargy, and suffering manifests. The guṇas theory underpins the philosophy of mind in Yoga school of Hinduism.
The early scholars of Yoga philosophy, posit that the Puruṣa (consciousness) by its nature is sattva (constructive), while Prakriti (matter) by its nature is tamas (chaotic). They further posit that individuals at birth have buddhi (intelligence, sattvic). As life progresses and churns this buddhi, it creates asmita or ahamkara (ego, rajasic). When ego in turn is churned by life, manas (temper, mood, tamasic) is produced. Together, buddhi, ahamkara and manas interact and constitute citta (mind) in Yoga school of Hinduism. Unrestrained modification of citta causes suffering. A way of life that empowers one to become ever more aware of one's consciousness and spirituality innate in buddhi, is the path to one's highest potential and a more serene, content, liberated life. Patanjali's Yoga sutra begins, in verse 2 of Book 1, by defining Yoga as "restraining the Citta from Vrittis."
Yoga school of Hinduism holds that ignorance is the cause of suffering and saṁsāra. Liberation, like many other schools, is removal of ignorance, which is achieved through discriminative discernment, knowledge and self-awareness. The Yoga Sūtras is Yoga school's treatise on how to accomplish this. Samādhi is the state where lucid awareness develops, state Yoga scholars, and this is how one starts the process of becoming aware of Purusa and true Self. It further claims that this awareness is eternal, and once this awareness is achieved, a person cannot ever cease being aware; this is moksha, the soteriological goal in Hinduism.
Book 3 of Patanjali's Yogasutra is dedicated to the three last limbs of ashtangha yoga, together called sanyama in verses III.4 to III.5, and calls it the technology for "discerning principle" and mastery of citta and self-knowledge. In verse III.12, the Yogasutras state that this discerning principle then empowers one to perfect sant (tranquility) and udita (reason) in one's mind and spirit, through intentness. This leads to one's ability to discern the difference between sabda (word), artha (meaning) and pratyaya (understanding), and this ability empowers one to compassionately comprehend the cry/speech of all living beings. Once a yogi reaches this state of sanyama, it leads to unusual powers, intuition, self-knowledge, freedoms and kaivalya, the soteriological goal of the yogi.
The benefits of Yoga philosophy of Hinduism are then summarized in verses III.46 to III.55 of Yogasutras, stating that the first five limbs leads to bodily perfections such as beauty, loveliness, strength and toughness; while the last three limbs through sanyama leads to mind and psychological perfections of perceptiveness, one's nature, mastery over egoism, discriminative knowledge of purity, self and soul. This knowledge once reached is irreversible, states Yogasutra's Book IV.
Yoga philosophy allows the concept of God, unlike the closely related Samkhya school of Hinduism which is non-theistic. Hindu scholars such as the 8th century Adi Sankara, as well many modern academic scholars describe the Yoga school as "Samkya school with God."
The Yoga Sutras of Patanjali use the term Isvara in 11 verses: I.23 through I.29, II.1, II.2, II.32 and II.45. Ever since the Sutras' release, Hindu scholars have debated and commented on who or what is Isvara. These commentaries range from defining Isvara as a "personal god" to a "special self" to "anything that has spiritual significance to the individual". Whicher explains that while Patanjali's terse verses can be interpreted both as theistic or non-theistic, Patanjali's concept of Isvara in Yoga philosophy functions as a "transformative catalyst or guide for aiding the yogin on the path to spiritual emancipation".
Patanjali defines Isvara (Sanskrit: ईश्वर) in verse 24 of Book 1, as "a special Self (पुरुषविशेष, puruṣa-viśeṣa)",
This sutra adds the characteristics of Isvara as that special Self which is unaffected (अपरामृष्ट, aparamrsta) by one's obstacles/hardships (क्लेश, klesha), one's circumstances created by the past or by one's current actions (कर्म, karma), one's life fruits (विपाक, vipâka), and one's psychological dispositions or intentions (आशय, ashaya).
Preparatory ethical rules in the texts of Yoga school of Hindu philosophy include both a theory of values through the observances of positive values and avoidance of negative, as well as an aesthetic theory on bliss from intrinsic and extrinsic perspectives. The values to be observed are called Niyamas, while those to be avoided are referred in the Yamas in Yoga philosophy.
Over sixty different ancient and medieval era texts of Yoga philosophy discuss Yamas and Niyamas. The specific theory and list of values varies between the texts, however, Ahimsa, Satya, Asteya, Svādhyāya, Kșhamā, and Dayā are among the predominantly discussed ethical concepts by majority of these texts.
The five yamas listed by Patañjali in Yogasūtra 2.30 are:
Patanjali, in Book 2, explains how and why each of the above self restraints help in the personal growth of an individual. For example, in verse II.35, Patanjali states that the virtue of nonviolence and non-injury to others (Ahimsa) leads to the abandonment of enmity, a state that leads the yogi to the perfection of inner and outer amity with everyone, everything. Other texts of the Yoga school of Hinduism include Kṣamā (क्षमा, forgiveness), Dhṛti (धृति, fortitude, non-giving up in adversity), Dayā (दया, compassion), Ārjava (आर्जव, non-hypocrisy) and Mitāhāra (मितहार, measured diet).
The Niyamas part of theory of values in the Yoga school include virtuous habits, behaviors and observances. The Yogasutra lists the niyamas as:
As with Yamas, Patanjali explains how and why each of the above Niyamas help in the personal growth of an individual. For example, in verse II.42, Patanjali states that the virtue of contentment and acceptance of others as they are (Santoṣa) leads to the state where inner sources of joy matter most, and the craving for external sources of pleasant ceases. Other texts of the Yoga school expanded the list of values under Niyamas, to include behaviors such as Āstika (आस्तिक, belief in personal God, faith in Self, conviction that there is knowledge in Vedas/Upanishads), Dāna (दान , charity, sharing with others), Hrī (ह्री, remorse and acceptance of one's past/mistakes/ignorance, modesty) Mati (मति, think and reflect, reconcile conflicting ideas) and Vrata (व्रत, resolutions and vows, fast, pious observances).
Yoga school, like Samkhya school, considers Pratyakṣa or Dṛṣṭam (direct sense perception), Anumāna (inference), and Śabda or Āptavacana (verbal testimony of the sages or shāstras) to be the only valid means of knowledge or Pramana. Unlike few other schools of Hinduism such as Advaita Vedanta, Yoga did not adopt the following three Pramanas: Upamāṇa (comparison and analogy), Arthāpatti (postulation, deriving from circumstances) or Anupalabdi (non-perception, negative/cognitive proof).
The most studied ancient and medieval era texts of the Yoga school of philosophy include those by Patanjali, Bhaskara, Haribhadra (Jain scholar), Bhoja, and Hemachandra.
References to the teachings of the Yoga school of Hinduism abound in ancient Indian texts of other orthodox schools of Hinduism, for example, verse 5.2.17 of Vaisheshika Sutra by Kanada, belonging to the Vaisheshika school of Hinduism and dated to be from the 1st millennium BCE, states
The Nyāya Sūtras by Akshapada variously dated to be from 4th to 2nd century BCE, and belonging to the Nyaya school of Hinduism, in chapter 4.2 discusses the importance of Yoga as follows,
The Brahma Sutras by Badarayana, estimated to have been completed in its surviving form in approx. 400–450 CE, while the original version might be ancient and composed between 500 BCE and 200 BCE, belonging to the Vedanta school of Hinduism, in chapter 2 assumes the existence of a text called Yoga Smriti. Scholars contest whether this text was a precursor or the same as Patanjali's Yogasutra, but either premise is uncertain. The verses of Brahma Sutras assert that dualism of the prevailing Yoga philosophy is refuted, as the value of Yoga is as a means to realization of the Self, not in propositions about Self that is in conflict with the Vedic texts. Radhakrishnan translates the text as follows,
The Yoga Vasistha is a syncretic text on Yoga philosophy, variously dated to be from 6th- to 14th-century CE. It is structured as a dialogue between sage Vasistha of the Vedic era and the philosopher-king Rama of the Hindu epic Ramayana. The text synthesizes elements of Vedanta, Jainism, Yoga, Samkhya, Saiva Siddhanta and Mahayana Buddhism. Among other things, the text discusses Yoga philosophy in its various chapters. In section 6.1, Yoga Vasistha introduces Yoga as follows,
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