History of Western Philosophy - Bertrand Russell [174]
The period with which we shall be concerned in this book differs from earlier and later times not only in philosophy, but in many other ways. The most notable of these is the power of the Church. The Church brought philosophic beliefs into a closer relation to social and political circumstances than they have ever had before or since the medieval period, which we may reckon from about A.D. 400 to about A.D. 1400. The Church is a social institution built upon a creed, partly philosophic, partly concerned with sacred history. It achieved power and wealth by means of its creed. The lay rulers, who were in frequent conflict with it, were defeated because the great majority of the population, including most of the lay rulers themselves, were profoundly convinced of the truth of the Catholic faith. There were traditions, Roman and Germanic, against which the Church had to fight. The Roman tradition was strongest in Italy, especially among lawyers; the German tradition was strongest in the feudal aristocracy that arose out of the barbarian conquest. But for many centuries neither of these traditions proved strong enough to generate a successful opposition to the Church; and this was largely due to the fact that they were not embodied in any adequate philosophy.
A history of thought, such as that upon which we are engaged, is unavoidably one-sided in dealing with the Middle Ages. With very few exceptions, all the men of this period who contributed to the intellectual life of their time were churchmen. The laity in the Middle Ages slowly built up a vigorous political and economic system, but their activities were in a sense blind. There was in the later Middle Ages an important lay literature, very different from that of the Church; in a general history, this literature would demand more consideration than is called for in a history of philosophic thought. It is not until we come to Dante that we find a layman writing with full knowledge of the ecclesiastical philosophy of his time. Until the fourteenth century, ecclesiastics have a virtual monopoly of philosophy, and philosophy, accordingly, is written from the standpoint of the Church. For this reason, medieval thought cannot be made intelligible without a fairly extensive account of the growth of ecclesiastical institutions, and especially of the papacy.
The medieval world, as contrasted with the world of antiquity, is characterized by various forms of dualism. There is the dualism of clergy and laity, the dualism of Latin and Teuton, the dualism of the kingdom of God and the kingdoms of this world, the dualism of the spirit and the flesh. All these are exemplified in the dualism of Pope and Emperor. The dualism of Latin and Teuton is an outcome of the barbarian invasion, but the others have older sources. The relations of clergy and laity, for the Middle Ages, were to be modelled on the relations of Samuel and Saul; the demand for the supremacy of the clergy arose out of the period of Arian or semi-Arian emperors and kings. The dualism of the kingdom of God and the kingdoms of this world is found in the New Testament, but was systematized in Saint Augustine's City of God. The dualism of the spirit and the flesh is to be found