functions transcends other sciences, speculative and practical. One speculative science is said to be worthier than another, by reason of its certitude, or the dignity of its matter. In both respects this science surpasses other speculative sciences, because the others have certitude from the natural light of human reason, which may err; but this has certitude from the light of the divine knowledge, which cannot be deceived; likewise by reason of the dignity of its matter, because primarily it relates to matters too high for reason, while other sciences consider only those which are subjected to reason. It is worthier than the practical sciences, which are ordained for an ulterior end; for so far as this science is practical, its end is eternal beatitude, unto which as an ulterior end all other ends of the practical sciences are ordained (ordinantur).
"Moreover although this science may accept something from the philosophical sciences, it requires them merely for the larger manifestation of the matters which it teaches. For it takes its principles, not from other sciences, but immediately from God through revelation. So it does not receive from them as from superiors, but uses them as servants. Even so, it uses them not because of any defect of its own, but because of the defectiveness of our intellect which is more easily conducted (manuducitur) by natural reason to the things above reason which this science teaches."
Thomas now shows, with scholastic formalism, that God is the subjectum of this science; since all things in it are treated with reference to God (sub ratione Dei), either because they are God himself, or because they bear relationship (habent ordinem) to God as toward their cause and end (principium et finem). The final question is whether this science be argumentativa, using arguments and proofs; and Thomas thus sets forth his masterly solution:
"I reply, it should be said that as other sciences do not prove their first principles, but argue from them in order to prove other matters, so this science does not argue to prove its principles, which are articles of Faith, but proceeds from them to prove something else, as the Apostle, in i Corinthians xv., argues from the resurrection of Christ to prove the resurrection of us all. One should bear in mind that in the philosophic sciences the lower science neither proves its own first principles nor disputes with him who denies them, but leaves that to a higher science. But the science which is the highest among them, that is metaphysics, does dispute with him who denies its principles, if the adversary will concede anything; if he concede nothing
