I'd put it this way: 1. «A righteousness from ***» It equals to «A righteousness that comes from ***» Now, it's in direct analogy to, for example, «A book that is interesting», which in turn semantically equals «An interesting book». Of course, indefinite article here, because we want to refer to an object (righteousness, book) from a multitude (all righteousnesses, all books) with certain properies (thigns coming from ***, interesting things).
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guideline in regard to the use of an indefinite article before arighteousness is not countable!ncountable noun
CalifJimrighteousness is not countable!Yes.