Resentment is when I take poison and wait for you to die. - Rick Hanson

the ANS — which is part of the larger nervous system — is intertwined with and helps regulate every other system. And mental activity has greater direct influence over the ANS than any other bodily system. When you stimulate the parasympathetic wing of the ANS, calming, soothing, healing ripples spread through your body, brain, and mind.

In the simulator, upsetting events from the past play again and again, which unfortunately strengthens the neural associations between an event and its painful feelings.

The autobiographical self (D’Amasio 2000) incorporates the reflective self and some of the emotional self, and it provides the sense of “I” having a unique past and future. The core self involves an underlying and largely nonverbal feeling of “I” that has little sense of the past or the future. If the PFC — which provides most of the neural substrate of the autobiographical self — were to be damaged, the core self would remain, though with little sense of continuity with the past or future. On the other hand, if the subcortical and brain stem structures which the core self relies upon were damaged, then both the core and autobiographical selves would disappear, which suggests that the core self is the neural and mental foundation of the autobiographical self (D’Amasio 2000). When your mind is very quiet, the autobiographical self seems largely absent, which presumably corresponds to a relative deactivation of its neural substrate. Meditations that still the mind, such as the concentration practices we explored in the previous chapter, improve conscious control over that deactivation process.