This knowledge can be understood by a person who has made relationship with Krsna and is a surrendered soul. Without being surrendered, it is very difficult to understand the controller and the energies, how He is controlling everything. Tubhyam prapannaya asesatah samagrena upadeksyami. This is the condition. You will find in the later chapters that Krsna says, naham prakasah sarvasya [Bg. 7.25]. Just like if you enter into any educational institution, if you don't surrender yourself to the rules and regulation of the institution, how you can get advantage of the knowledge imparted by the institution? Everywhere, wherever you want to receive something, you have to be controlled or you have to be surrendered to the rules and regulation. Just like in our class we are imparting some lessons from the Bhagavad-gita, and if you do not follow the rules and regulations of this class, it is not possible to receive the knowledge. Similarly, the full knowledge of the controller and the process of controlling can be understood when one is surrendered like Arjuna to Krsna. Unless one is surrendered soul, it is not possible.
Lecture on Bhagavad-gita 7.2, San Francisco, September 11, 1968