justsit wrote:What may feel threatening could be as simple as boredom, or as complex as fear of lack of inherent "self."
Yes. Both of these seem likely causes of the threatening feeling that arises from (the prospect of) simply being with "what is."
The unadorned present moment can easily feel boring for those of us who live from (melo)dramatic stimulus to stimulus. If you're a stimulus junkie, giving up that (melo)drama, even for a few minutes, can feel oppressively boring, like dead air.
Even deeper I think is the fear of lack of self. Self is not invited to the party of simply being with "what is." Or, to be more accurate, reified self driving the organism is not invited. Self, along with everything else, IS invited in the sense that when feelings of self arise, they are part of "what is."
Anything else besides boredom and fear of lack of self cause the feeling of being threatened by oneness with "what is?"