All śāstric injunctions, as well as the versions of great sages and authorities, establish that a bona fide spiritual master is not necessarily a brāhmaṇa by caste. The only qualification is that he be conversant with the science of Kṛṣṇa, Kṛṣṇa consciousness. That alone makes one perfectly eligible to become a spiritual master.
-Teachings of Lord Caitanya, Chapter 31

सा श्रद्दधानस्य विवर्धमाना
विरक्तिमन्यत्र करोति पुंस: ।
हरे: पदानुस्मृतिनिर्वृतस्य
समस्तदु:खाप्ययमाशु धत्ते ॥ १३ ॥

For one who is anxious to engage constantly in hearing such topics, kṛṣṇa-kathā gradually increases his indifference towards all other things. Such constant remembrance of the lotus feet of Lord Kṛṣṇa by the devotee who has achieved transcendental bliss vanquishes all his miseries without delay.
-Shrimad Bhagvatam Canto 3 Chapter 5 Verse 13