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Rāja-vidyā: The King of Knowledge
from material conditioning and attain to the kingdom of God. In this age it is impossible to practice sacrifice, speculation or  yoga . There is no way open to us but the way of hearing submissively from authoritative sources. This is the way the  mahātmās  received the most confidential knowledge. It is the way Arjuna received it from Kṛṣṇa, and it is the way we must receive it from the disciplic succession stemming from Arjuna.