Srimad Bhagavatam Canto 04, Chapter 09, Text 28

SB 4.9.28

vidura uvaca
sudurlabham yat paramam padam harer
 mayavinas tac-caranarcanarjitam
labdhvapy asiddhartham ivaika-janmana
 katham svam atmanam amanyatartha-vit
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:  
 
Sri Vidura inquired: My dear brahmana, the abode of the Lord is very difficult to attain. It can be attained only by pure devotional service, which alone pleases the most affectionate, merciful Lord. Dhruva Maharaja achieved this position even in one life, and he was very wise and conscientious. Why, then, was he not very pleased?
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Saint Vidura’s inquiry is very relevant. The word artha-vit, which refers to one who knows how to discriminate between reality and unreality, is very significant in this connection. An artha-vit is also called paramahamsa. A paramahamsa accepts only the active principle of everything. Just as a swan accepts only the milk from a mixture of water and milk, a paramahamsa accepts only the Supreme Personality of Godhead as his life and soul, neglecting all external, material things. Dhruva Maharaja was in this category, and due to his determination he achieved the result he desired, but still, when he returned home he was not very pleased.
Srimad Bhagavatam Canto 04, Chapter 09, Text 27
Srimad Bhagavatam Canto 04, Chapter 09, Text 29