Attributed to Patañjali
«I bow to Patañjali, the noblest of sages, who removed the impurities of the mind by yoga, of speech by grammar and of the body by medicine.»
Misattributed
Verdict
It is not in Patañjali's work
A Sanskrit verse (yogena cittasya padena vācāṃ…) recited at the start of many yoga classes as if it were an ancient invocation. It is not by Patañjali but in praise of him, and it is late: Meulenbeld places it in a tradition that begins with King Bhoja's commentary (11th c.), the first source to unite the three disciplines in a single person.
Source: Meulenbeld, G. Jan. A History of Indian Medical Literature, vol. IA. Groninga: Egbert Forsten, 1999 (sobre los Patañjali médicos y la estrofa de Bhoja).
What they did say
Verified words of Patañjali
«Now the exposition of yoga [is to be made].»
Yogasūtra 1.1; trad. inglesa de James Haughton Woods (1914, dominio público); versión española del investigador
«Yoga is the restriction of the fluctuations of mind-stuff.»
Yogasūtra 1.2; trad. inglesa de James Haughton Woods (1914, dominio público); versión española del investigador
«Then the Seer [that is, the Self] abides in himself.»
Yogasūtra 1.3; trad. inglesa de James Haughton Woods (1914, dominio público); versión española del investigador