SB 3.15.34
tad vam amusya paramasya vikuntha-bhartuh
kartum prakrstam iha dhimahi manda-dhibhyam
lokan ito vrajatam antara-bhava-drstya
papiyasas traya ime ripavo ’sya yatra
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Therefore let us consider how these two contaminated persons should be punished. The punishment should be apt, for thus benefit can eventually be bestowed upon them. Since they find duality in the existence of Vaikuntha life, they are contaminated and should be removed from this place to the material world, where the living entities have three kinds of enemies.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The reason why pure souls come into the existential circumstances of the material world, which is considered to be the criminal department of the Supreme Lord, is stated in Bhagavad-gita, Seventh Chapter, verse 27. It is stated that as long as a living entity is pure, he is in complete harmony with the desires of the Supreme Lord, but as soon as he becomes impure he is in disharmony with the desires of the Lord. By contamination he is forced to transfer to this material world, where the living entities have three enemies, namely desire, anger and lust. These three enemies force the living entities to continue material existence, and when one is free from them he is eligible to enter the kingdom of God. One should not, therefore, be angry in the absence of an opportunity for sense gratification, and one should not be lusty to acquire more than necessary. In this verse it is clearly stated that the two doormen should be sent into the material world, where criminals are allowed to reside. Since the basic principles of criminality are sense gratification, anger and unnecessary lust, persons conducted by these three enemies of the living entity are never promoted to Vaikunthaloka. People should learn Bhagavad-gita and accept the Supreme Personality of Godhead, Krsna, as the Lord of everything; they should practice satisfying the senses of the Supreme Lord instead of trying to satisfy their own senses. Training in Krsna consciousness will help one be promoted to Vaikuntha.