Who under what circumstances has the right to declare that a violation of halacha is in order because "it is a time to act for Hashem"?
I have by now a few times seen this posuk from Tehillim used as justification for changing the halacha, i.e., by rabbis. I have also seen individuals -- even simple Jews -- use it to justify their actions.
It would seem to me that only a navi or an exceptionally qualified rabbi (if not rabbinate) is in a position to use this heter to stretch the halacha. But I don't know. Exactly who is allowed to use it, under what circumstances, and to what extent? Is there ever any justification for an individual, learned or not, to use this excuse based on his own judgment?