Krsna's flute and the gopis
Srimad-Bhagavatam
SB Canto 6
SB 6.16.34, Purport:
The Lord and the devotees both conquer. The Lord is conquered by the devotees, and the devotees are conquered by the Lord. Because of being conquered by one another, they both derive transcendental bliss from their relationship. The highest perfection of this mutual conquering is exhibited by Kṛṣṇa and the gopīs. The gopīs conquered Kṛṣṇa, and Kṛṣṇa conquered the gopīs. Thus whenever Kṛṣṇa played His flute, He conquered the minds of the gopīs, and without seeing the gopīs Kṛṣṇa could not be happy. Other transcendentalists, such as jñānīs and yogīs, cannot conquer the Supreme Personality of Godhead; only pure devotees can conquer Him.