svayam

न हि ज्ञानेन सदृशं पवित्रमिह विद्यते

svayam — oneself

Nothing in this world purifies like knowledge. One perfected in practice finds it in time, within.

आहुस्त्वामृषयः सर्वे देवर्षिर्नारदस्तथा

svayam — personally

All the seers say it of you — Narada, Asita, Devala, Vyasa — and you yourself tell me so.

व्यासप्रसादाच्छ्रुतवानेतद्गुह्यमहं परम्

svayam — himself

By the grace of Vyasa I have heard this highest secret, this yoga, spoken by Krishna himself, the master of yoga, in person.