Srimad Bhagavatam

References to text SB 7.11.35
SB 7.11.35: If one shows the symptoms of being a brāhmaṇa, kṣatriya, vaiśya or śūdra, as described above, even if he has appeared in a different class, he should be accepted according to those symptoms of classification.

Text №
“Whether one is a brāhmaṇa, a sannyāsī or a śūdra — regardless of what he is — he can become a spiritual master if he knows the science of Kṛṣṇa.”
Talks Between Sri Caitanya Mahaprabhu and Ramananda Raya
CC 2.8.128
“Your book should describe the characteristics of the bona fide guru and the bona fide disciple. Then, before accepting a spiritual master, one can be assured of the spiritual master’s position. Similarly, the spiritual master can also be assured of the disciple’s position. The Supreme Personality of Godhead, Kṛṣṇa, should be described as the worshipable object, and you should describe the bīja-mantra for the worship of Kṛṣṇa, as well as that for Rāma and for other expansions of the Supreme Personality of Godhead.
The Sixty-One Explanations of the Atmarama Verse
CC 2.24.330
“Your book should describe the characteristics of the bona fide guru and the bona fide disciple. Then, before accepting a spiritual master, one can be assured of the spiritual master’s position. Similarly, the spiritual master can also be assured of the disciple’s position. The Supreme Personality of Godhead, Kṛṣṇa, should be described as the worshipable object, and you should describe the bīja-mantra for the worship of Kṛṣṇa, as well as that for Rāma and for other expansions of the Supreme Personality of Godhead.
The Sixty-One Explanations of the Atmarama Verse
CC 2.24.330
“Such a position may befit others, but I do not possess such spiritual power. I belong to a lower class and have not even a pinch of devotion to Kṛṣṇa.”
Lord Sri Caitanya Mahaprabhu Tastes Nectar from the Lips of Lord Sri Krishna
CC 3.16.29