Eternal Yoga has no beginning

पुरूष नित्य गुरू नित्य है, नित्य योग गम ज्ञान |
सृिष्ट प्रवाह अनादि है, महिमा योग महान || 5.1.12
Purūṣa nitya gurū nitya hai, nitya yōga gama jñāna |
Sr̥ṣṭi pravāha anādi hai, mahimā yōga mahāna || 5.1.12

Purport: Supreme being is eternal, Sadguru is eternal, so is the true yoga, eternal and one through which one attains complete enlightenment. The knowledge obtained in true yoga is called Brahma Vidya which is preserved by the Sadguru from one generation to the next and thus has no beginning in the creation. This is the great glory of the true Yoga of Brahma Vidya, the science of consciousness.