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Rāja-vidyā: The King of Knowledge
There are many names for God throughout the world and throughout the universe, but Kṛṣṇa is the supreme name according to Vedic knowledge. Therefore Lord Caitanya Mahāprabhu recommended the chanting of Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare as the supreme means for realization in this age. Caitanya Mahāprabhu did not make any distinctions as to caste or social position. Indeed, most of His foremost disciples were considered to be fallen in society. Caitanya Mahāprabhu even appointed Haridāsa Thākura, a Mohammedan, as  nāmācārya , or preceptor of the holy names. Similarly, Rūpa and Sanātana Gosvāmīs, two of Lord Caitanya's principle disciples, were formerly known as Sākara Mallik and Dabir Khās, and they were employed by the Mohammedan government. In those days, the Hindus were so strict that if a  brāhmaṇa  accepted service from a non-Hindu, he was immediately ostracized from Hindu society. Despite this, Rūpa and Sanātana Gosvāmīs were made principle authorities in the science of Kṛṣṇa by Caitanya Mahāprabhu. So there is no bar against anyone; anyone can become a spiritual master provided he knows the science of Kṛṣṇa. This is the only qualification, and this science in essence is contained in  Bhagavad-gītā . At the present moment, thousands of spiritual masters are needed to spread this great science throughout the world.
We should understand that when Kṛṣṇa is speaking to Arjuna in  Bhagavad-gītā , He is speaking not simply to Arjuna alone but to the whole human race.