SB 10.46.29
tayor ittham bhagavati
krsne nanda-yasodayoh
viksyanuragam paramam
nandam ahoddhavo muda
Translation:
Uddhava then joyfully addressed Nanda Maharaja, having clearly seen the supreme loving attraction he and Yasoda felt for Krsna, the Supreme Personality of Godhead.
Purport:
If Uddhava had seen Nanda and Yasoda actually suffering, he would not have reacted with joy. But in fact all emotions on the spiritual platform are transcendental bliss. The so-called anguish of the pure devotees is another form of loving ecstasy. This was clearly seen by Uddhava, and thus he spoke as follows.