bhagavān āha tāñ chivaḥ
Lord Śiva voluntarily came to bless the sons of the King as well as do something beneficial for them. He personally chanted the mantra so that the mantra would be more powerful, and he advised that the mantra be chanted by the King’s sons (rāja-putras). When a mantra is chanted by a great devotee, the mantra becomes more powerful. Although the Hare Kṛṣṇa mahā-mantra is powerful in itself, a disciple upon initiation receives the mantra from his spiritual master, for when the mantra is chanted by the spiritual master, it becomes more powerful. Lord Śiva advised the sons of the King to hear him attentively, for inattentive hearing is offensive.