My 2c: The opposite of Zen's peace is ...
not a kind of unpeaceful agitation.
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Several things are on fire in my life rn, so I am much too agitated to put up a very coherent argument for what I think is the opposite of Zen's peace. But it's not agitation. It's guilt. More to the point guilt-before-self.
The precepts, why do they give you peace? Because if you get half your body crushed by a concrete beam right now, you can just die.
Foyan:
>Many are those who have seen but can do nothing about it. Once you have seen, why can't you do anything about it? Just because of not discerning; that is why you are helpless. If you see and discern, then you can do something about it.
*Do something about it? Discern?* It's almost as if, there's the opposite of peace (even if you SEE)