The story behind this verse is that the two sons of Kuvera (the treasurer of the demigods) were puffed up on account of the opulence of their father, and so once on a heavenly planet they were enjoying themselves in a lake with some naked damsels of heaven. At that time the great saint Nārada Muni was passing on the road and was sorry to see the behavior of the sons of Kuvera. Seeing Nārada passing by, the damsels of heaven covered their bodies with cloth, but the two sons, being drunkards, did not have this decency. Nārada became angry with their behavior and cursed them thusly: "You have no sense, so it is better if you become trees instead of the sons of Kuvera." Upon hearing this, the boys came to their senses and begged Nārada to be pardoned for their offenses. Nārada then said, "Yes, you shall become trees, arjuna trees, and you will stand at the courtyard of Nanda Mahārāj. But Kṛṣṇa Himself will appear in time as the foster son of Nanda, and He will deliver you." In other words, the curse of Nārada was a benediction to the sons of Kuvera because indirectly it was foretold that they would be able to receive the favor of Lord Kṛṣṇa. After that, Kuvera's two sons stood as two big arjuna trees in the courtyard of Nanda Mahārāj until Lord Dāmodara, in order to fulfill the desire of Nārada, dragged the milling pestle to which He was tied and struck the two trees, violently causing them to fall down. From out of these fallen trees came Nalakūvara and Maṇigrīva, who had by then become great devotees of the Lord.
There is a passage in the Hayaśīrṣa Purāṇa which states, "My dear Lord, O Supreme Personality of Godhead, I do not want any resultant benediction from my religious life, nor do I want any economic development, nor do I want to enjoy sense gratification, nor liberation. I simply pray to be an eternal servant at Your lotus feet. Kindly oblige me and give me this benediction."
In the same Hayaśīrṣa Purāṇa, after Nṛsiṁhadeva wanted to give benediction to Prahlāda Mahārāj, Prahlāda did not accept any material benediction and simply asked the favor of the Lord to remain His eternal devotee. In this connection, Prahlāda Mahārāj cited the example of Hanumān, the eternal servitor of Lord Rāmacandra, who also set an example by never asking any material favor from the Lord. He always remained engaged in His service. That is the ideal character of Hanumān, for which he is still worshiped by all devotees. Prahlāda Mahārāj also offered his respectful obeisances unto Hanumān. There is a well-known verse spoken by Hanumān in which he says, "My dear Lord, if You like You can give me salvation from this material existence, or the privilege of merging into Your existence, but I do not wish any of these things. I do not want anything which diminishes my relationship with You as master and servant, even after liberation."
In a similar passage in Nārada-pañcarātra it is stated, "My dear Lord, I do not wish any perfectional stage by performing the ritualistic religious ceremonies or by economic development or by sense gratification or liberation. I simply pray that You grant me the favor of keeping me under Your lotus feet. I do not wish any kind of liberation such as sālokya, to reside on Your planet, or sārūpya, to have the same bodily features as You. I simply pray for Your favor that I may be always engaged in Your loving service."
Similarly, in the Sixth Canto, 14th Chapter, 4th verse of Śrīmad-Bhāgavatam, Mahārāj Parīkṣit inquires from Śukadeva Gosvāmī, "My dear brāhmaṇa, I understand that the demon Vṛtrāsura was a great sinful person and that his mentality was completely absorbed in the modes of passion and ignorance. How did he develop to such a perfectional stage of devotional service to Nārāyaṇa? I have heard that even great persons who have undergone severe austerities and who are liberated with full knowledge must strive to become devotees of the Lord. It is understood that such persons are very rare and almost never to be seen, so I am astonished that Vṛtrāsura has become such a devotee!"