Srimad Bhagavatam Canto 10, Chapter 08, Text 48

SB 10.8.48

sri-suka uvaca
drono vasunam pravaro
dharaya bharyaya saha
karisyamana adesan
brahmanas tam uvaca ha
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Sukadeva Gosvami said: To follow the orders of Lord Brahma, Drona, the best of the Vasus, along with his wife, Dhara, spoke to Lord Brahma in this way.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
As stated in the Brahma-samhita (5.37):
 
ananda-cinmaya-rasa-pratibhavitabhis
tabhir ya eva nija-rupataya kalabhih
goloka eva nivasaty akhilatma-bhuto
govindam adi-purusam tam aham bhajami
 
When Krsna descends anywhere, He is accompanied by His own associates. These associates are not ordinary living beings. Krsna’s pastimes are eternal, and when He descends, He comes with His associates. Therefore Nanda and mother Yasoda are the eternal father and mother of Krsna. This means that whenever Krsna descends, Nanda and Yasoda, as well as Vasudeva and Devaki, also descend as the Lord’s father and mother. Their personalities are expansions of Krsna’s personal body; they are not ordinary living beings. Maharaja Pariksit knew this, but he was curious to know from Sukadeva Gosvami whether it is possible for an ordinary human being to come to this stage by sadhana-siddhi. There are two kinds of perfection nitya-siddhi and sadhana-siddhi. A nitya-siddha is one who is eternally Krsna’s associate, an expansion of Krsna’s personal body, whereas a sadhana-siddha is an ordinary human being who, by executing pious activities and following regulative principles of devotional service, also comes to that stage. Thus the purpose of Maharaja Pariksit’s inquiry was to determine whether an ordinary human being can attain the position of mother Yasoda and Nanda Maharaja. Sukadeva Gosvami answered this question as follows.
Srimad Bhagavatam Canto 10, Chapter 08, Text 47
Srimad Bhagavatam Canto 10, Chapter 08, Text 49