śhabda-ādīn

श्रोत्रादीनीन्द्रियाण्यन्ये संयमाग्निषु जुह्वति

śhabda-ādīn — sound vibration, etc

Some offer hearing and the other senses into the fire of restraint; others offer sound and the other objects of sense into the fire of the senses.

पूर्वाभ्यासेन तेनैव ह्रियते ह्यवशोऽपि सः

śhabda-brahma — fruitive portion of the Vedas

Carried by that earlier practice, such a person is drawn on even without willing it. And even one who merely wishes to know of yoga goes beyond the letter of the scriptures.

बुद्ध्या विशुद्धया युक्तो धृत्याऽऽत्मानं नियम्य च

śhabda-ādīn viṣhayān — sound and other objects of the senses

Joined to a purified understanding, holding the self in check by steadiness, having given up sound and the other objects of sense, having put aside craving and aversion;