From Gita’s 13th chapter…
Arjuna: What truly is the object of knowledge?
Krishna: When you come to know the true object of knowledge, you will experience immortal bliss. It is the beginningless spiritual energy that descends from me, described as beyond both existence and non-existence.
Arjuna: To be beyond both existence and non-existence is inconceivable. How then will I be able to perceive the object of knowledge?
Krishna: Its hand and feet are everywhere. Its eyes, heads, and faces are everywhere. It hears through every ear. It surrounds and permeates everything.
It is the power of illumination in all your senses, yet it is far away from all your senses. It has no affections, yet it certainly cares for everyone. It is beyond qualification, yet completely qualified.
It is within all living beings, yet beyond all of them. It is immovable, yet it moves. It is beyond full comprehension, because it is so subtle. It is very far away, but also very close.
It is indivisible, yet divided within everything. That object of knowledge creates, maintains, and destroys all things.
It is certainly the luminosity within all luminous things, described as “beyond darkness.” It is knowledge. It is the object of knowledge. And, within the hearts of all beings, it is approached through knowledge.
Arjuna’s eyes were wide with wonder and no words came from his mouth.
Krishna: So far, I’ve answered your questions about the “field,” and have explained that the field-knower is the spirit. I explained that the supreme spirit is the ultimate object of knowledge; and I have described the process of attaining this knowledge.
Arjuna [still stunned]: Yes… but who can fully understand what you have said?
Krishna: Someone like you. Those who have true devotion to me can comprehend all this in their effort to attain my intimate association.