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Rāja-Vidyā: The King of Knowledge
śrī bhagavān uvāca idaṁ tu te guhyatamaṁ pravakṣyāmy anasūyave jñānaṁ vijñāna-sahitaṁ yaj jñātvā mokṣyase 'śubhāt
“The Supreme Lord said: My dear Arjuna, because you are never envious of Me, I shall impart to you this most secret wisdom, knowing which you shall be relieved of the miseries of material existence.” (Bg. 9.1)
The opening words of the Ninth Chapter of  Bhagavad-gītā  indicate that the Supreme Godhead is speaking. Here Śrī Kṛṣṇa is referred to as Bhagavān.  Bhaga  means opulences, and  vān  means one who possesses. We have some conception of God, but in the Vedic literature there are definite descriptions and definitions of what is meant by God, and what is meant is described in one word—Bhagavān. Bhagavān possesses all opulences, the totality of knowledge, wealth, power, beauty, fame and renunciation. When we find someone who possesses these opulences in full, we are to know that he is God. There are many rich, wise, famous, beautiful and powerful men, but no one man can claim to possess all of these opulences. Only Kṛṣṇa claims to possess them in totality.