which came into existence after the patristic era, taught and handed down Catholic doctrine on strictly scientific lines, in obedience to and under the supervision of the bishops. The title belongs primarily to the Schoolmen of the Middle Ages—the Scholastic Theologians strictly so-called; then to all who followed the methods of the School during the last three centuries; and, generally, to all distinguished and approved writers on Theology whether they have adhered to the Scholastic methods or not. It is only in exceptional cases that the Church gives a public approbation to an individual Theologian, and this is done by canonization or by the still further honour of conferring on him the title of Doctor of the Church. When we speak of an Approved Author, we mean one who is held in general esteem on account of his learning and the Catholic spirit of his teaching. Some approved authors are of acknowledged weight, while others are of only minor importance. What we are about to state concerning the authority of Theologians must not be applied indiscriminately to every Catholic writer, but only to such as are weighty and approved (auctores probati et graves).
II. The authority of Theologians, like that of the Fathers, may be considered either individually and partially, or of the whole body collectively. As a rule, the authority of a single Theologian (with the exception of canonized Saints, and perhaps some authors of the greatest weight) does not create the presumption that no point of his doctrine was opposed to the common teaching of the Church in his day; much less that, independently of his reasons, the whole of his doctrine is positively probable merely on account of his authority. When, however, the majority of approved and weighty Theologians agree, it must be presumed that their teaching is not opposed to that of the Church. Moreover, if their doctrines are based upon sound arguments propounded without any prejudice and not contradicted very decidedly, the positive probability of the doctrines must be presumed. No more than this probability can be produced by the consent of many or even of all Theologians when they state a doctrine as a common opinion (opinio communis)
