राजयोगपदं चापि लभते नात्र संशयः । कुम्भकात्कुण्डलीबोधः कुण्डलीबोधतो भवेत् । अनर्गला सुषुम्णा च हठसिद्धिश्च जायते ॥ २.७५ ॥

rājayogapadaṃ cāpi labhate nātra saṃśayaḥ । kumbhakātkuṇḍalībodhaḥ kuṇḍalībodhato bhavet । anargalā suṣumṇā ca haṭhasiddhiśca jāyate ॥ 2.75 ॥

There is no doubt that this is how one attains Râja Yoga. The Kundalinî knowledge is attained by Kumbhaka and the Sushumnâ becomes free of impurities.