A red lense sees no red

"As St. Thomas put it, "Whatever knows certain things cannot have any of them in its own nature." Thus, if the eye were colored red, it wouldn't be able to perceive red objects. It can see red because it is clear, or "redless." Likewise, if we can but watch or witness our distresses, we prove ourselves thereby to be "distress-less," free of the witnessed turmoil. That within which feels pain is itself pain-less; that which feels fear is fear-less; that which perceives tension is tension-less. To witness these states is to transcend them. They no longer seize you from behind because you look at them up front."

Ken Wilber, No Boundary, p.116