In chapter 11 of the Bhagavad-Gita, Krishna reveals his real form to Arjuna. The chapter seems like a departure from the surrounding chapters, which focus on bhukti (i.e., devotion to Krishna). For example, in chapter 9, Krishna gives Arjuna the following imperative: “Always think of Me and become my devotee.” Unlike seeing the deity as he really is, sincere devotion to that which is based beyond the limits of human cognition, perception, and emotion is possible without being given “divine eyes.” The metaphysically, ontologically real is an attention-getter in the text, but it is the devotion, or bhukti, that is more important from a practical standpoint. Even theologically, the experience of transcendence, of which the human brain is capable, can be said to be more important than “seeing” divinity as it really is because the latter, unlike the former, lies beyond our grasp. In fact, seeing Krishna as he really exists is not necessary, for in chapter 10, Krishna says, “Here are some ways you can recognize and think of Me in the things around you [in the world].” This is yet another reason why the devotion rather than seeing Krishna as he really is, ontologically, should be the attention-getter in the Gita.
The full essay is at "On the Vision of Krishna."