"True light that makes true vision possible is not the light the body's eyes behold. It is a state of mind that has become so unified that darkness cannot be perceived at all. And thus what is the same is seen as one, while what is not the same remains unnoticed, for it is not there.
This is the light that shows no opposites, and vision, being healed, has power to heal. This is the light that brings your peace of mind to other minds, to share it and be glad that they are one
with you and with themselves. This is the light that heals because it brings single perception, based upon one frame of reference, from which one meaning comes.
Here are both giving and receiving seen as different aspects of one Thought whose truth does not depend on which is seen as first, nor which appears to be in second place. Here it is understood that both occur together, that the Thought remain complete. And in this understanding is the base on which all opposites are reconciled, because they are perceived from the same frame of reference which unifies this Thought.
One thought, completely unified, will serve to unify all thought. This is the same as saying one correction will suffice for all correction, or that to forgive one brother wholly is enough to bring salvation to all minds. For these are but some special cases of one law which holds for every kind of learning, if it be directed by the One Who knows the truth."
-Jesus Christ in ACIM, Lesson108