Essential distinction between feqh and ethics

Ethics and feqh are two Islamic sciences. Many scholars have tried to introduce their distinctions. It, however, seems that the most difference in the field lies in intention and motivation as basis in ethics but in feqh only in worships; though in this case also ethical motivation is of higher effect than feqhi intention. In fact, in feqh the conditions for the correctness of actions have been offered while in ethics the conditions of their being accepted. The former notices the appearance of action and thereof its being correct or incorrect; the latter, however, notices its depth as being a scale for purity of intention and motivation. Being of courage and intention to sin in leaving unlawfuls and in the case of kinlling somebody proposedly, when spilled in vain, can be counted as cases for the difference.