Text 14

sarvam etad rtam manye
yan mam vadasi keshava
na hi te bhagavan vyaktim
vidur deva na danavah

Translation

O Krishna, I totally accept as truth all that You have told me. Neither the demigods nor the demons, O Lord, can understand Your personality. 

Commentary by Srila Prabhupada 

Arjuna herein confirms that persons of faithless and demonic nature cannot understand Krishna. He is not known even by the demigods, so what to speak of the so-called scholars of this modern world? By the grace of the Supreme Lord, Arjuna has understood that the Supreme Truth is Krishna and that He is the perfect one. 

One should therefore follow the path of Arjuna. He received the authority of Bhagavad-gita. As described in the Fourth Chapter, the parampara system of disciplic succession for the understanding of Bhagavad-gita was lost, and therefore Krishna reestablished that disciplic succession with Arjuna because He considered Arjuna His intimate friend and a great devotee. Therefore, as stated in our Introduction to Gitopanishad, Bhagavad-gita should be understood in the parampara system. When the parampara system was lost, Arjuna was selected to rejuvenate it. The acceptance by Arjuna of all that Krishna says should be emulated; then we can understand the essence of Bhagavad-gita, and then only can we understand that Krishna is the Supreme Personality of Godhead.

Commentary by Sri Visvanatha Cakravarti Thakur

I do not doubt at all what you say to me. But these rsis say that your supreme body is without birth. They do not know about your birth (vyaktim). They do not understand how you with your svarupa of para brahma can be both unborn and born. What you have said in verse 10.2 - that neither the devatas nor rsis know about your birth - I accept as completely true. O Kesava, you bind up even Brahma and Siva with ignorance of your true nature. (ka=brahma, isa=siva, va=to bind). Then certainly it must be said that the devatas also do not know you.