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According to Karel Werner,
Patanjali's system is unthinkable without Buddhism. As far as its terminology goes there is much in the Yoga Sutras that reminds us of Buddhist formulations from the Pāli Canon and even more so from the Sarvāstivāda Abhidharma and from Sautrāntika."[32]
Robert Thurman writes that Patañjali was influenced by the success of the Buddhist monastic system to formulate his own matrix for the version of thought he considered orthodox.[33] However, it is also to be noted that the Yoga Sutra, especially the fourth segment of Kaivalya Pada, contains several polemical verses critical of Buddhism, particularly the Vijñānavāda school of Vasubandhu.[34]
Samādhi
Samādhi is oneness with the object of meditation. There is no distinction between act of meditation and the object of meditation. Samādhi is of two kinds,[35][web 7] with and without support of an object of meditation:[web 8]
Samprajnata Samādhi, also called savikalpa samādhi and Sabija Samādhi,[web 9][note 12] meditation with support of an object.[web 8][note 13]
Samprajata samādhi is associated with deliberation, reflection, bliss, and I-am-ness.[39][note 14] The first two, deliberation and reflection, form the basis of the various types of samapatti:[39][41]
Savitarka, "deliberative":[39][note 15] The citta is concentrated upon a gross object of meditation,[web 8] an object with a manifest appearance that is perceptible to our senses,[42] such as a flame of a lamp, the tip of the nose, or the image of a deity.[citation needed] Conceptualization (vikalpa) still takes place, in the form of perception, the word and the knowledge of the object of meditation.[39] When the deliberation is ended this is called nirvitaka samādhi.[43][note 16]
Savichara, "reflective":[42] the citta is concentrated upon a subtle object of meditation,[web 8][42] which is not percpetible to the senses, but arrived at through interference,[42] such as the senses, the process of cognition, the mind, the I-am-ness,[note 17] the chakras, the inner-breath (prana), the nadis, the intellect (buddhi).[42] The stilling of reflection is called nirvichara samapatti.[42][note 18]
Sananda Samadhi, ananda,[note 19] "bliss": this state emphasizes the still subtler state of bliss in meditation;[web 8]
Sasmita: the citta is concentrated upon the sense or feeling if "I-am-ness".[web 8]
Asamprajnata Samādhi, also called Nirvikalpa Samādhi[web 7] and Nirbija Samādhi:[web 7][note 20] meditation without an object,[web 8] which leads to knowledge of purusha or consciousness, the subtlest element.[42][note 21]
Ananda and asmita
According to Ian Whicher, the status of sananda and sasmita in Patanjali's system is a matter of dispute.[45] According to Maehle, the first two constituents, deliberation and reflection, form the basis of the various types of samapatti.[39] According to Feuerstein,
"Joy" and "I-am-ness" […] must be regarded as accompanying phenomenaof every coginitive [ecstacy]. The explanations of the classical commentators on this point appear to be foreign to Patanjali's hierarchy of [ecstatic] states, and it seems unlikely that ananda and asmita should constitue independent levels of samādhi.[45]
Ian Whicher disagrees with Feuerstein, seeing ananda and asmita as later stages of nirvicara-samapatti.[45] Whicher refers to Vācaspati Miśra (900-980 CE), the founder of the Bhāmatī Advaita Vedanta who proposes eight types of samapatti:[46]
Savitarka-samāpatti and Nirvitarka-samāpatti, both with gross objects as objects of support;
Savicāra-samāpatti and Nirvicāra-samāpatti, both with subtle objects as objects of support;
Sānanda-samāpatti and Nirānanda-samāpatti, both with the sense organs as objects of support
Sāsmitā-samāpatti and Nirasmitā-samāpatti, both with the sense of "I-am-ness" as support.
Vijnana Bikshu (ca. 1550-1600) proposes a six-stage model, explicitly rejecting Vacaspati Misra's model. Vijnana Bikshu regards joy (ananda) as a state that arises when the mind passes beyond the vicara stage.[41] Whicher agrees that ananda is not a separate stage of smadhi.[41] According to Whicher, Patanjali's own view seems to be that nirvicara-samādhi is the highest form of cognitive ecstacy.[41]