All things are revealed by the knower. The Self is revealed through all things. As their own nature is the same, perceive the knower and the known as one. To understand this verse, consider yourself to be the subject, and everything else to be objects. You are the subject and the knower. You reveal or perceive all things. You consider yourself to have a different identity from other objects, and you give a separate identity to other objects. You call other people or other objects by their name. You define other objects, and because of you, other objects are known. The Self is revealed through all things. This relationship works both ways. You know yourself only because of other objects. If there was no other object, how could you perceive of yourself as someone with a separate identity? You need at least one other object, so that you can define yourself in relation to that. You can define yourself as being different from that.
As their own nature is the same, perceive the knower and the known as one. Their nature is the same, because without one, the other does not exist. Because of the subject, objects are given an identity. Because of objects, the subject is given an identity. One cannot exist without the other. Because they cannot exist separately, they cannot be separate. They are all one and the same thing. Therefore, perceive of yourself as one with everything else. Believe you are one with all of life. You are not separate with the rest of existence. Because without them, you have no meaning. When you believe you are one with all of life, you drop your ego. And then, you become one with God and all of existence .