Having reached those regions he began Yoga. Adopting a voice governed by the rules of the science called Shiksha, he began to chant Vedic Mantras,
रसां पुनः प्रविष्टश्च योगं परममास्थितः॥ शैक्ष्यं स्वरं समास्थाय उद्गीतं प्रासृजत् स्वरम्।