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Rāja-vidyā: The King of Knowledge
There are also many philosophers with different opinions, and they're always contradicting one another. If the truth cannot be understood by reading various scriptures, by logical argument or philosophical theories, then how can it be attained? The fact is that the wisdom of the Absolute Truth is very confidential, but if we follow the authorities, it can be understood.
In India, there are disciplic successions coming from Rāmānujācārya, Madhvācārya, Nimbārka, Viṣṇusvāmī and other great sages. The Vedic literatures are understood through the superior spiritual masters. Arjuna understood  Bhagavad-gītā  from Kṛṣṇa, and if we wish to understand it, we have to understand it from Arjuna, not from any other source. If we have any knowledge of  Bhagavad-gītā , we have to see how it tallies with the understanding of Arjuna. If we understand  Bhagavad-gītā  in the same way that Arjuna did, we should know that our understanding is correct. This should be the criteria for our studying of  Bhagavad-gītā . If we actually want to receive benefit from  Bhagavad-gītā , we have to follow this principle.  Bhagavad-gītā  is not an ordinary book of knowledge which we can purchase from the market place, read and merely consult a dictionary to understand. This is not possible. If it were, Kṛṣṇa would never have told Arjuna that the science was lost.
It is not difficult to understand the necessity of going through the disciplic succession to understand  Bhagavad-gītā . If we wish to be a lawyer, an engineer or doctor, we have to receive knowledge from the