Language, truth and knowledge

It would prove futile to address every incidence of curiosity by seeking out the requisite "knowledge" that constitutes the "knowable" volume of the subject through an isolationist perspective; it is also obviously futile to address the content in its entirety lest the curiosity—essentially the context within which any epistemological exegesis becomes meaningful—stands overwhelmed. If I were to associate any semantic weight with the idea of justice, I would ask: where does the knowledge, "the truth", of law arise from, what is the need that, in the eyes of those who partake of its provisions, it assesses, and what is the modality within which it finds realization? Could there exist an epistemological variable the evaluation of which represents a (quantitative or qualitative) difference between the cognitive value of a statement of truth and that of a statement of law, thereby, say, establishing the origin of the truth of law as being independent of the same social urges that are the domain (of applicability) of the sanctions it backs?