Why: Arjuna admits that, thinking of Krishna merely as a friend, he may have addressed him carelessly, out of love or carelessness, not knowing his true greatness, offering an honest, retrospective apology for earlier familiarity.

In life: realizing someone or something you'd been casually familiar with actually carries far more depth or significance than you'd previously recognized can prompt a genuine, retrospective reconsideration of how you'd been treating them.

Teaching: if you realize you've been treating someone or something with more casualness than their actual depth or significance deserves, it's worth directly acknowledging that shift in understanding, the way Arjuna does here, rather than quietly adjusting without ever naming it.