Religion, the Divine Law and Expediency

According to authentic religious texts and right reason, sending prophets and descending celestial books and legislation of law by God should have a purpose. The motivation and result of these three matters is nothing other than providing the felicity and expediency of the addressees and the obliged people. The fact that God's action has a purpose is not in contradiction with the rule of "superordinate does nothing for the sake of subordinate". This article will discuss the relation between expediency and sending the prophets, descending books and legislating laws and will more elaborately discuss the relation between expediency and the Divine law (and consequently the relation between expediency and jurisprudence).