Aquinas on definition and subject of Metaphysics: nessaccity of sacred Theology

Thomas Aquinas as a Christian theologian believes that learning Metaphysics is necessary for every Christian theologian and for this reason، Thomas as a Theologian and not as a philosopher has different Metaphysical views. Due to his Christian belief، he has a special approach to definition and subject matter of Metaphysic. For Aquinas، Metaphysics is the science that studies being qua being، but God does not fall under the notion of being qua being and since God is a complete being in itself، there is another science that consider God as the subject matter. Aquinas names this science «Sacred Theology» and believes that it is beyond the Metaphysics and all other human sciences. Aquinas by different arguments proves that sacred Theology is necessary.