These are the most confidential devotees of Lord Caitanya. Other pure devotees, who are more or less attached to Śrī Nityānanda Prabhu and Advaita Prabhu, are attracted by other transcendental relationships, such as parental affection, friendship and servitorship. When such devotees are very much attached to the activities of Lord Caitanya, they at once become confidential devotees in conjugal love with the Supreme Lord.
There is a very nice song sung by Śrī Narottama Dāsa Ṭhākura, a great devotee and ācārya in the disciplic succession from Lord Caitanya. Narottama Dāsa sings: "When will there be transcendental eruptions all over my body simply by my hearing the name of Gaurāṅga? When will tears incessantly flow from my eyes simply by my uttering the names of the Lord? When will Lord Nityānanda have mercy upon me and make all my desires for material enjoyment insignificant? When shall I be purified by giving up all contaminations of material enjoyment? And when shall I be able to see the transcendental abode, Vṛndāvana? When shall I be eager to accept the Six Gosvāmīs as my prime guides? And when will I be able to understand the conjugal love of Kṛṣṇa?" No one should be eager to understand the conjugal love of Kṛṣṇa without undergoing disciplinary training under the Six Gosvāmīs of Vṛndāvana.