Srila Prabhupada- In Bhagavad-gītā there is reference to bodhayantaḥ parasparam , “discussing among themselves.” Generally pure devotees utilize their valuable time in chanting and discussing various activities of Lord Kṛṣṇa or Lord Caitanya amongst themselves. There are innumerable books, such as the purāṇas, Mahābhārata, Bhāgavatam, Bhagavad-gītā and Upaniṣads, which contain countless subjects for discussion among two devotees or more. Friendship should be cemented between persons with mutual interests and understanding. Such persons are said to be sva jāti, “of the same caste.”

(SB 3.29.17p )