Srimad Bhagavatam Canto 04, Chapter 12, Text 26

SB 4.12.26

anasthitam te pitrbhir
anyair apy anga karhicit
atistha jagatam vandyam
tad visnoh paramam padam
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
Dear King Dhruva, neither your forefathers nor anyone else before you ever achieved such a transcendental planet. The planet known as Visnuloka, where Lord Visnu personally resides, is the highest of all. It is worshipable by the inhabitants of all other planets within the universe. Please come with us and live there eternally.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
When Dhruva Maharaja went to perform austerities, he was very determined to achieve a post never dreamed of by his forefathers. His father was Uttanapada, his grandfather was Manu, and his great-grandfather was Lord Brahma. So Dhruva wanted a kingdom even greater than Lord Brahma could achieve, and he requested Narada Muni to give him facility for achieving it. The associates of Lord Visnu reminded him that not only his forefathers but everyone else before him was unable to attain Visnuloka, the planet where Lord Visnu resides. This is because everyone within this material world is either a karmi, a jñani or a yogi, but there are hardly any pure devotees. The transcendental planet known as Visnuloka is especially meant for devotees, not for karmis, jñanis or yogis. Great rsis or demigods can hardly approach Brahmaloka, and as stated in Bhagavad-gita, Brahmaloka is not a permanent residence. Lord Brahma’s duration of life is so long that it is difficult to estimate even the duration of one day in his life, and yet Lord Brahma also dies, as do the residents of his planet. Bhagavad-gita (8.16) says, abrahma-bhuvanal lokah punar avartino ’rjuna: except for those who go to Visnuloka, everyone is subjected to the four principles of material life, namely birth, death, old age and disease. The Lord says, yad gatva na nivartante tad dhama paramam mama: “The planet from which, once going, no one returns is My supreme abode.” (Bg. 15.6) Dhruva Maharaja was reminded, “You are going in our company to that planet from which no one returns to this material world.” Material scientists are attempting to go to the moon and other planets, but they cannot imagine going to the topmost planet, Brahmaloka, for it is beyond their imagination. By material calculation, traveling at the speed of light it would take forty thousand light-years to reach the topmost planet. By mechanical processes we are unable to reach the topmost planet of this universe, but the process called bhakti-yoga, as executed by Maharaja Dhruva, can give one the facility not only to reach other planets within this universe, but also to reach beyond this universe to the Visnuloka planets. We have outlined this in our small booklet Easy Journey to Other Planets.
Srimad Bhagavatam Canto 04, Chapter 12, Text 25
Srimad Bhagavatam Canto 04, Chapter 12, Text 27