ei tina-sevā - rendering service to these three; haite - from; kṛṣṇa-prema - ecstatic love for Kṛṣṇa; haya - there is; punaḥ punaḥ - again and again; sarva-śāstre - all the revealed scriptures; phu-kāriyā kaya - declare loudly.

By rendering service to these three, one attains the supreme goal of ecstatic love for Kṛṣṇa. In all the revealed scriptures this is loudly declared again and again.