When a devotee is permanently situated in devotional service, and by different symptoms of ecstasy he has developed and matured a fraternal mellow or flavor in relationship with the Personality of Godhead, at that time his feeling is called fraternal love of Godhead.
The impetus for such fraternal love of God is God Himself. When one is liberated and discovers his eternal relationship with the Supreme Lord, the Lord Himself becomes the impetus for increasing fraternal love. The eternal associates of the Lord in Vṛndāvana have described this as follows: "The Lord, Hari, whose bodily hue is like the indranīla jewel, whose smiling is as beautiful as the kunda flower, whose silk dress is as yellow as golden autumn foliage, whose chest is beautified with garlands of flowers and who is always playing upon His flute—this enemy of the Agha demon is always attracting our hearts by wandering about Vṛndāvana."
There are similar statements of fraternal love expressed outside the jurisdiction of Vṛndāvana. When the sons of Pāṇḍu, headed by Mahārāj Yudhiṣṭhira, saw Kṛṣṇa in His fourhanded form on the battlefield of Kurukṣetra, holding His conchshell, disk, club and lotus flower, they completely forgot themselves and became merged in the ocean of nectarean happiness. This shows how the sons of Pāṇḍu-King Yudhiṣṭhira, Bhīma, Arjuna, Nakula and Sahadeva—were all caught up in fraternal love for Kṛṣṇa.
Sometimes the different names, forms, paraphernalia and transcendental qualities provoke fraternal love: For instance, Kṛṣṇa's nice dress, the all-auspicious symptoms on His body, His strongly-built body, His knowledge of different languages, His learned teachings in the Bhagavad-gītā, His uncommon genius in all fields of endeavor, His exhibition of expert knowledge, His mercy, His chivalry, His behavior as a conjugal lover, His intelligence, His forgiveness, His attraction for all kinds of men, His opulence and His happiness—all provoke fraternal love.
The impetus to fraternal love upon seeing the associates of Kṛṣṇa in Vṛndāvana is also very natural, for their personal bodily features, their qualities and dress are all equal to Kṛṣṇa's. These associates are always happy in their service to Kṛṣṇa, and they are generally known as vayasyas, or friends of the same age. These vayasyas are fully confident of protection by Kṛṣṇa. Devotees sometimes pray: "Let us offer our respectful obeisances unto the vayasyas of Kṛṣṇa, who are firmly convinced of Kṛṣṇa's friendship and protection and whose devotion to Kṛṣṇa is ever-fixed. They are fearless, and on a level equal with Kṛṣṇa they discharge their transcendental loving devotional service." Such eternal vayasyas are also found beyond the jurisdiction of Vṛndāvana, in places such as Dvārakā and Hastināpura. Except for Vṛndāvana, all the places of Kṛṣṇa's pastimes are called puras (towns). Mathurā and Hastināpura, the capital of the Kurus, are both puras. Personalities like Arjuna, Bhīma, Draupadī and Śrīdāmā Brāhmaṇa are counted amongst Kṛṣṇa's fraternal devotees in the puras.