The difference of this system from that of the Yoga sûtra is: (1) the conception of God has risen here to such an importance that he has become the only object of meditation, and absorption in him is the goal; (2) the importance of the yama [Footnote ref 1] and the niyama has been reduced to the minimum; (3) the value of the Yoga discipline as a separate means of salvation apart from any connection with God as we find in the Yoga sûtra has been lost sight of; (4) liberation and Yoga are defined as absorption in God; (5) the introduction of Brahman; (6) the very significance of Yoga as control of mental states (citta@rttinirodha) is lost sight of, and (7) rasâyana (alchemy) is introduced as one of the means of salvation.
From this we can fairly assume that this was a new modification of the Yoga doctrine on the basis of Patañjali's Yoga sûtra in the direction of Vedânta and Tantra, and as such it probably stands as the transition link through which the Yoga doctrine of the sûtras entered into a new channel in such a way that it could be easily assimilated from there by later developments of Vedânta, Tantra and S'aiva doctrines [Footnote ref 2]. As the author mentions rasâyana as a means of salvation, it is very probable that he flourished after Nâgarjuna and was probably the same person who wrote Pâtañjala tantra, who has been quoted by S'ivadâsa in connection with alchemical matters and spoken of by Nâges'a as "Carake Patañjali@h." We can also assume with some degree of probability that it is with reference to this man that Cakrapa@ni and Bhoja made the confusion of identifying him with the writer of the _Mahâbhâ@sya. It is also very probable that Cakrapâ@ni by his line "pâtañjalamahâbhâ@syacarakapratisa@msk@rtai@h" refers to this work which was called "Pâtañjala." The commentator of this work gives some description of the lokas, dvîpas and the sâgaras, which runs counter to the descriptions given in the Vyâsabhâ@sya, III. 26, and from this we can infer that it was probably written at a time when the Vyâsabhâ@sya was not written or had not attained any great sanctity or authority. Alberuni
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[Footnote 1: Alberuni, in his account of the book of Sâ@mkhya, gives a list of commandments which practically is the same as yama and niyama, but it is said that through them one cannot attain salvation.]
[Footnote 2: Cf. the account of Pâs'upatadars'ana in Sarvadas'anasa@mgraha.]
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also described the book as being very famous at the time, and Bhoja and Cakrapâ@ni also probably confused him with Patañjali the grammarian; from this we can fairly assume that this book of Patañjali was probably written by some other Patañjali within the first 300 or 400 years of the Christian era; and it may not be improbable that when Vyâsabhâ@sya quotes in III. 44 as "iti Patañjali@h," he refers to this Patañjali.
The conception of Yoga as we meet it in the Maitrâya@na Upani@sad consisted of six a@ngas or accessories, namely prâ@nâyâma, pratyâhâra, dhyâna, dhara@nâ, tarka and samâdhi [Footnote ref 1]. Comparing this list with that of the list in the Yoga sûtras we find that two new elements have been added, and tarka has been replaced by âsana. Now from the account of the sixty-two heresies given in the Brahmajâla sutta we know that there were people who either from meditation of three degrees or through logic and reasoning had come to believe that both the external world as a whole and individual souls were eternal. From the association of this last mentioned logical school with the Samâdhi or Dhyâna school as belonging to one class of thinkers called s'âs'vatavâda, and from the inclusion of tarka as an a@nga in samâdhi, we can fairly assume that the last of the a@ngas given in Maitrâya@nî Upani@sad represents the oldest list of the Yoga doctrine, when the Sâ@mkhya and the Yoga were in a process of being grafted on each other, and when the Sa@mkhya method of discussion did not stand as a method independent of the Yoga. The substitution of âsana for tarka in the list of Patañjali shows that the Yoga had developed a method separate from the Sa@mkhya. The introduction of ahi@msâ (non-injury), satya (truthfulness), asteya (want of stealing), brahmacaryya (sex-control), aparigraha (want of greed) as yama and s'auca (purity), santo@sa (contentment) as niyama, as a system of morality without which Yoga is deemed impossible (for the first time in the sûtras), probably marks the period when the disputes between the Hindus and the Buddhists had not become so keen. The introduction of maitrî, karu@nâ, muditâ, upek@sâ is also equally significant, as we do not find them mentioned in such a prominent form in any other literature of the Hindus dealing with the subject of emancipation. Beginning from the Âcârâ@ngasûtra, Uttarâdhyayanasûtra,
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[Footnote 1: prâ@nâyâmah pratyâhârah dhyânam dhara@nâ tarkah samâdhih sa@da@nga ityucyate yoga (Maitr. 6 8).]