ekada sa vimanena

 visnu-dattena bhasvata

girisam dadrse gacchan

 paritam siddha-caranaih

 

alingyankikrtam devim

 bahuna muni-samsadi

uvaca devyah srnvantya

 jahasoccais tad-antike

 

Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 

 

One time while King Citraketu was traveling in outer space on a brilliantly effulgent airplane given to him by Lord Visnu, he saw Lord Siva, surrounded by Siddhas and Caranas. Lord Siva was sitting in an assembly of great saintly persons and embracing Parvati on his lap with his arm. Citraketu laughed loudly and spoke, within the hearing of Parvati.

 

Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 

 

Srila Visvanatha Cakravarti Thakura says in this connection,

 

bhaktim bhutim harir dattva

 sva-vicchedanubhutaye

devyah sapena vrtratvam

 nitva tam svantike ’nayat

 

The purport is that the Supreme Personality of Godhead wanted to bring Citraketu to Vaikunthaloka as soon as possible. The Lord’s plan was that Citraketu be cursed by Parvati to become Vrtrasura so that in his next life he could quickly return home, back to Godhead. There have been many instances in which a devotee acting as a demon has been brought to the kingdom of God by the mercy of the Lord. For Parvati to be embraced by Lord Siva was natural in a relationship between husband and wife; this was nothing extraordinary for Citraketu to see. Nonetheless, Citraketu laughed loudly to see Lord Siva in that situation, even though he should not have done so. Thus he was eventually cursed, and this curse was the cause of his returning home, back to Godhead.