SB 5.1.20
sri-suka uvaca
iti samabhihito maha-bhagavato bhagavatas tri-bhuvana-guror anusasanam atmano laghutayavanata-sirodharo badham iti sabahu-manam uvaha.
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Sri Sukadeva Gosvami continued: After thus being fully instructed by Lord Brahma, who is the spiritual master of the three worlds, Priyavrata, his own position being inferior, offered obeisances, accepted the order and carried it out with great respect.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Sri Priyavrata was the grandson of Lord Brahma. Therefore according to social etiquette, his position was inferior. It is the duty of the inferior to carry out the order of the superior with great respect. Priyavrata therefore immediately said, “Yes, sir. I shall carry out your order.” Priyavrata is described as a maha-bhagavata, a great devotee. The duty of a great devotee is to carry out the order of the spiritual master, or the spiritual master of the spiritual master in the parampara system. As described in Bhagavad-gita (4.2), evam parampara praptam: one has to receive the instructions of the Supreme Lord through the disciplic chain of spiritual masters. A devotee of the Lord always considers himself a servant of the servant of the servant of the Lord.