Jesus is literally asking us to become spirit-identified rather than body-identified, to recognize that our body is merely an image being projected by our mind (which we can stop projecting at any time), and to learn to stop seeing ourselves AND others as bodies.
That's no small request either. We are so used to being bodies and seeing bodies, we think it is normal and natural.
One thing to realize is that a body is not a first-hand experience and it is not the origin or source of a person. It is a secondary layer placed OVER the inner spirit to try to hide it.
So when you are looking at a body and you see fish and bones and eyes and a face and you think that as you look at THAT, you are SEEING the person, you are not. You are seeing a wall of denial and separation. A disguise. It's designed to BLOCK you from seeing the person that is "trapped" inside, locked up in the body and unseen by anyone.
The body is a device for separation. And the golden rule always applies. What we see in others we see in ourselves. In order to become aware that we are not a body ourselves we have to overcome all forms of separation and all attack. And only when we can not see ourselves as a body will we be able to see past the bodies of others.
This is also the meaning of "God is in everything I see because God is in my mind".... ie, if you can get to where you have awareness of God in your mind, you will STOP seeing bodies entirely because God is not a body. If you are seeing God, you are not seeing form. You cannot see two worlds. So this does NOT mean that you see God "in the world", it means that God is ALL THERE IS and THERE IS NO WORLD.
It's a huge challenge to actually get to an experiential state where a) you do not believe you are a body at all (genuinely), b) you do not see your body as your self, c) your sense of identity is not attached to the body whatsoever, d) you do not see others as their bodies, e) you recognize that all bodies are fictional puppets that people dangle in front of them to pretend to interact, and f) that you do not need a body at all in order to exist as divine spirit.
Overcoming the body is the same thing as overcoming death. If you can become free of the body consciously and deliberately without using death to do so, you no longer need a body and can make it disappear. It will become transparent and will vanish.