arjuna uvaacha:
madanugrhaaya paramam guhyamadhyaatmasangitam |
yattvayoktam vachastena mohoyam vigato mama || 1 ||

Arjuna said:
Out of compassion for me, you have spoken about the supreme secret known as the knowledge of the self. By those statements, my delusion has been destroyed.

madanugrhaaya : out of compassion for me
paramam : supreme
guhyam : secret
adhyaatma : knowledge of the self
sangitam : known as
yat : that
tvayaa : you have
uktam : spoken
vachaha : statements
tena : by those
mohaha : delusion
ayam : this
vigataha : destroyed
mama : my
We begin the eleventh chapter with Arjuna’s words. He recalls the root cause of his panic attack from the first chapter which is moha or delusion which caused confusion between his duty as a warrior and as a family member. He now says that his delusion has been dispelled. How did that happen? It is only because Shri Krishna revealed the knowledge of the self, Adhyaatma vidyaa, to Arjuna, the answer to the question “who am I?”
When Arjuna understood his true nature as the self, the aatmaa, the eternal essence, he came to know that the self does not kill or be killed, it is neither the doer of action or the enjoyer of the results. He then realized that even if his body died, or his body killed another body, nothing would happen to the eternal essence in each of those bodies. Given the power of this knowledge to destroy the biggest delusion about who he was, he terms it “paramam” or supreme. And since it requires a sincere student and a rare teacher, he terms it “guhyam” or secret.
Now, we may think that there was something special in Arjuna that qualified him to receive this supreme knowledge. Arjuna was humble enough to acknowledge that it was purely out of compassion that Shri Krishna showered his grace upon him and gave him this knowledge. Only through the grace and compassion of Ishvara and a qualified guru can one receive this knowledge.
Another aspect of the teaching was Ishvara’s involvement with the universe. Arjuna highlights it in the next shloka.