CC Madhya 16.36

sākṣi-gopālera kathā kahe nityānanda
śuniyā vaiṣṇava-mane bāḍila ānanda
Word for word: 
sākṣi-gopālera — of the Deity known as Sākṣi-gopāla; kathā — the narration; kahe — describes; nityānanda — Nityānanda Prabhu; śuniyā — hearing; vaiṣṇava-mane — in the minds of all the Vaiṣṇavas; bāḍila — increased; ānanda — the transcendental bliss.
Translation: 
When Nityānanda Prabhu described all the activities of Sākṣi-gopāla, transcendental bliss increased in the minds of all the Vaiṣṇavas.
Purport: 

For these activities refer to Madhya-līlā, chapter five, verses 8-138.