To remain in the poverty-stricken condition is a kind of austerity. According to Vedic culture, therefore, the brāhmaṇas, as a matter of routine, keep themselves in a poverty-stricken condition to save themselves from the false prestige of material opulence. False prestige due to advancement of material prosperity is a great impediment for spiritual emancipation. A poverty-stricken man cannot become unnaturally fat by eating more and more. And on account of not being able to eat more than he requires, his senses are not very turbulent. When the senses are not very turbulent, he cannot become violent.
Another advantage of poverty is that a saintly person can easily enter a poor man's house, and thus the poor man can take advantage of the saintly person's association. A very opulent man does not allow anyone to enter his house; therefore, the saintly person cannot enter. According to the Vedic system, a saintly person takes the position of a mendicant so that on the plea of begging something from the householder, he can enter any house. The householder, who has usually forgotten everything about spiritual advancement because he is busy maintaining family affairs, can be benefited by the association of a saintly person. There is a great chance for the poor man to become liberated through association with a saint. Of what use are persons who are puffed up with material opulence and prestige if they are bereft of the association of saintly persons and devotees of the Supreme Personality of Godhead?
The great sage Nārada thereafter thought that it was his duty to put those demigods into a condition where they could not be falsely proud of their material opulence and prestige. Nārada was compassionate and wanted to save them from their fallen life. They were in the mode of darkness, and being therefore unable to control their senses, they were addicted to sex life. It was the duty of a saintly person like Nārada to save them from their abominable condition. In animal life, the animal has no sense to understand that he is naked. But Kuvera was the treasurer of the demigods, a very responsible man, and Nalakūvara and Maṇigrīva were two of his sons. And yet they became so animalistic and irresponsible that they could not understand, due to intoxication, that they were naked. To cover the lower part of the body is a principle of human civilization, and when men or women forget this principle, they become no better than animals. Nārada therefore thought that the best punishment for them was to make them immovable living entities, or trees. Trees are, by nature's laws, immovable. Although trees are covered by the mode of ignorance, they cannot do harm. The great sage Nārada thought it fitting that, although the brothers would be punished to become trees, by his mercy they would continue to keep their memory and be able to know why they were being punished. After changing the body, a living entity generally forgets his previous life, but in special cases, by the grace of the Lord, as with Nalakūvara and Maṇigrīva, one can remember.