Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura comments on this verse. Externally a devotee performs all the items of devotional service in nine different ways, beginning with śravaṇa and kīrtana, and within his mind he always thinks of his eternal relationship with Kṛṣṇa and follows in the footsteps of the devotees of Vṛndāvana. If one engages himself in the service of Rādhā and Kṛṣṇa in this way, he can transcend the regulative principles enjoined in the śāstras and, through his spiritual master, fully engage in rendering spontaneous love to Kṛṣṇa. In this way, he attains affection at the lotus feet of Kṛṣṇa. Kṛṣṇa actually comes under the control of such spontaneous feelings, and ultimately one can attain association with the Lord.