As stated in Bhagavad-gita (7.16), catur-vidha bhajante mam janah sukrtino rjuna. Without sukrti, or pious activities, no one can come to the shelter of the Supreme Personality of Godhead. The Lord is approached by four kinds of pious men (arto jijnasur artharthi jnani ca), but here we see that Nanda Maharaja and Yasoda surpassed all of them. Therefore Pariksit Maharaja naturally inquired, What kind of pious activities did they perform in their past lives by which they achieved such a stage of perfection? Of course, Nanda Maharaja and Yasoda are accepted as the father and mother of Krsna, yet mother Yasoda was more fortunate than Nanda Maharaja, Krsnas father, because Nanda Maharaja was sometimes separated from Krsna whereas Yasoda, Krsnas mother, was not separated from Krsna at any moment. From Krsnas babyhood to His childhood and from His childhood to His youth, mother Yasoda was always in association with Krsna. Even when Krsna was grown up, He would go to Vrndavana and sit on the lap of mother Yasoda. Therefore there is no comparison to the fortune of mother Yasoda, and Pariksit Maharaja naturally inquired, yasoda ca maha-bhaga.