SB 10.11.9
darsayams tad-vidam loka
atmano bhrtya-vasyatam
vrajasyovaha vai harsam
bhagavan bala-cestitaih
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
To pure devotees throughout the world who could understand His activities, the Supreme Personality of Godhead, Krsna, exhibited how much He can be subdued by His devotees, His servants. In this way He increased the pleasure of the Vrajavasis by His childhood activities.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
That Krsna performed childhood activities to increase the pleasure of His devotees was another transcendental humor. He exhibited these activities not only to the inhabitants of Vrajabhumi, but also to others, who were captivated by His external potency and opulence. Both the internal devotees, who were simply absorbed in love of Krsna, and the external devotees, who were captivated by His unlimited potency, were informed of Krsna’s desire to be submissive to His servants.