Regulative devotee
Sri Caitanya-caritamrta
CC Madhya-lila
The advanced devotee who is inclined to spontaneous loving service should follow the activities of a particular associate of Kṛṣṇa"s in Vṛndāvana. He should execute service externally as a regulative devotee as well as internally from his self-realized position. Thus he should perform devotional service both externally and internally.
CC Madhya 22.158, Translation and Purport: "The advanced devotee who is inclined to spontaneous loving service should follow the activities of a particular associate of Kṛṣṇa"s in Vṛndāvana. He should execute service externally as a regulative devotee as well as internally from his self-realized position. Thus he should perform devotional service both externally and internally.’
This verse is also found in the Bhakti-rasāmṛta-sindhu (1.2.295).