The Nature and the Necessity of the Islamic Ethics

Is it necessary for the Islamic moral teachings to provide the essential elements needed for establishing a moral order? Is there any necessity that these elements possess a logical structure? If so, do all moral teachings of primary and secondary Islamic sources enjoy in fact such a logical structure? If not, is there any way to be reached? There are various doubts and debates about these questions explicitly or implicitly. The writer is agreed with those whose answers to these questions are positive. This paper with a metaethical approach is an explanatory introduction to this claim.