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Rāja-vidyā: The King of Knowledge
who listens to Kṛṣṇa without envy. Arjuna does not cavil with Kṛṣṇa but agrees with whatever He says. This is his special qualification, and this is the way of understanding  Bhagavad-gītā . It is not possible to understand what God is by our own mental speculations; we have to hear, and we have to accept.
Because Arjuna is not envious, Kṛṣṇa speaks this special knowledge to him. This is not only theoretical knowledge but practical knowledge ( vijñāna-sahitam ). Whatever knowledge we receive from  Bhagavad-gītā  should not be taken for sentimentality or fanaticism. The knowledge is both  jñāna  and  vijñāna , theoretical wisdom and scientific knowledge. If one becomes well-versed in this knowledge, liberation is certain. Life in this material world is by nature inauspicious and miserable.  Mokṣa  means liberation, and the promise is that by dint of understanding this knowledge one will attain liberation from all miseries. It is important then to understand what Kṛṣṇa says about this knowledge.
rāja-vidyā rāja-guhyam  
 pavitram idam uttamam  
 pratyakṣāvagamam dharmyam  
 susukham kartum avyayam
“This knowledge is the king of education, the most secret of all secrets. It is the purest knowledge, and because it gives direct perception of the self by realization, it is the perfection of religion. It is everlasting, and it is joyfully performed.” (Bg. 9.2)
According to  Bhagavad-gītā , the topmost knowledge ( rāja-vidyā rāja-guhyam ) is Kṛṣṇa consciousness because in  Bhagavad-gītā  we find that the symptom