The nervous system is like the vertical spine of the cross that bears the horizontal outcroppings of space and time.
To forget the highs and lows of the nervous system is to remember Oneness in Love. To give them power is to seem as if to exist outside of the stability of the Kingdom of Heaven and at the mercy of duality. The nervous system interprets the effects of ecstatic thought, as well as “the detour into fear” (ACIM).
In the perceptual dream of the self split in two, there is consciousness of the dream vs unconsciousness of the dream. For every high of the nervous system that Mind attaches to in the dream of a split-from-Source-self, there is a corresponding low that Mind tries to avoid. For every thought of Love made unconscious, there is conscious pain. When the focus is on the dream, Awareness of Interchange in Love seems obscured by the seeming roller coaster of outer change.
Jesus spoke to the unreality of the nervous system by His untainted-by-belief Knowledge of Oneness. Recall not the nervous system that speaks to the belief in separation by responding to the illusion of outer change, but the Interchange in Love that is not the dream.