I’m going to assume from the silence that the EBT’s say nothing specifically directed to validating fears.
IMO the ethics of right speech may be implicated.
I assume the problem with validating fears has to do with a judgement that the validation is incorrect or misleading.
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Regarding the Reflecting on Rebirth: An Understanding That Can Go Beyond Faith and Theory thread. I shared a critical view based on my experience about rebirth and it was welcomed. I did so in the spirit of sn36.21; of what “one can know for oneself”.