Here in this verse Narada Muni has described Dhruva Maharaja as prabhu. This word is applicable to the Supreme Personality of Godhead. Sometimes the spiritual master is addressed as Prabhupada. Prabhu means the Supreme Personality of Godhead, and pada means post. According to Vaisnava philosophy, the spiritual master occupies the post of the Supreme Personality of Godhead, or in other words he is the bona fide representative of the Supreme Lord. Dhruva Maharaja is also described here as prabhu because he is an acarya of the Vaisnava school. Another meaning of prabhu is master of the senses, just like the word svami. Another significant word is suduskaram, very difficult to perform. What was the task that Dhruva Maharaja undertook? The most difficult task in life is to satisfy the Supreme Personality of Godhead, and Dhruva Maharaja would be able to do that. We must remember that Dhruva Maharaja was not fickle; he was determined to execute his service and then come back. Every devotee, therefore, should be determined that in this life he will be able to satisfy the Supreme Personality of Godhead and by that process go back home, back to Godhead. That is the perfection of the highest mission of life.