CC Madhya-lila 09.156 - Narada-pancaratra
Sri Caitanya-caritamrta
CC Madhya-lila
CC Madhya 9.156, Translation and Purport:
“‘When the jewel known as vaidūrya touches various other materials, it appears to be separated into different colors, and consequently its forms also appear different. Similarly, according to the meditational ecstasy of the devotee, the Lord, who is known as Acyuta ("the infallible one"), appears in different forms, although He is essentially one.’”
This is a verse quoted from Śrī Nārada-pañcarātra.