Here is an interesting teaching.
In its natural state, the body is a communication medium. The mind is supposed to flow through it and extend BEYOND it outwards. The body itself is not supposed to be part of the message as such.
But when the mind starts to STOP at the body, or to be blocked by the body, or runs up against the body, it prevents it from extending PAST the body. The communication medium can no longer communicate because the flow is blocked. This is what blocks to love do. They make you fixate on form and be blinded by illusion, which get in the way of seeing Christ.
When there are blocks to love, mind cannot extend through and past and overlook the body, and so fixates ON the body. This causes you to perceive that the body is what is there, in the mind, rather than looking PAST it. The body becomes what you are looking AT, rather than that you are looking at Christ PAST the body.
Making perception stop AT the body and blocking the flow of love, basically cuts that flow off and stops it from moving outward. That means it has become stifled, and now there is a kind of "separation" which has been introduced between the body and the outside. Or a gap, where extension of love was supposed to fill it externally, but is now left empty due to the blocked expression.
This blocking of extension makes the body SICK, because it focuses the mind ON the body and AT the body, instead of PAST the body. The body then becomes attacked by the mind as though "colliding with it" instead of flowing naturally through it and past it and onward in communication. Kind of like a dirty camera lens, or a blocked toilet, or a bunch of boarded up windows made to block the light. Another example would be a "blocked artery", making the blood flow impeded, and resulting in death.
So the blocks to love have to be removed so that the "surface" of the communication medium doesn't turn into the "message" and so that love can flow and extend, which means love is radiated and increased, which means HEALING comes through the body and the body is MADE WHOLE because it is COMMUNICATING WHOLENESS. When the mind is sane and flowing fully and freely THROUGH the body, the body is HEALED as the love passes through it making it essentially immortal, incapable of sickness or death.
Here is how Jesus says it:
"The removal of blocks, then, is the ONLY way to guarantee help and healing. Help and healing are the normal expressions of a mind which is working through the body but not in it. If the mind believes the body is its GOAL, it WILL distort its perception OF the body, and by blocking its own extension BEYOND it, will INDUCE illness by FOSTERING SEPARATION. Perceiving the body AS A SEPARATE ENTITY cannot but foster illness, because it is not true. A medium of communication WILL lose its usefulness if it is used for anything else.
To use a medium of communication as a medium of ATTACK is an obvious confusion in purpose. To communicate is to join and to attack is to separate. How can you do both simultaneously WITH THE SAME THING, and NOT suffer? Perception of the body can be unified only by ONE PURPOSE. This releases the mind from the temptation to see it in many lights, and gives it over ENTIRELY to the One Light in which it can be really understood at all."