Without being surrendered, it is very difficult to understand the controller and the energies, how He is controlling everything. Tubhyāṁ prapannāya aśeṣataḥ samagreṇa upadekṣyāmi. This is the condition. You will find in the later chapters that Kṛṣṇa says, nāhaṁ prakāśaḥ 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-gītā, and if you do not follow the rules and regulation 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 Kṛṣṇa. Unless one is surrendered soul, it is not possible. You always remember that Kṛṣṇa, er, Arjuna surrendered himself to Kṛṣṇa. Śiṣyas te 'haṁ śādhi māṁ prapannam (BG 2.7). So therefore Kṛṣṇa is also speaking to him.
Actually, these discussions of scripture is not to be acted unless there is relationship between the speaker and the audience. So audience means the disciples. Disciple means who accept the discipline.