Cities were also markets for culture. The resumption of urban growth in the second half of the 15th century coincided with the diffusion of Renaissance ideas and educational values. Humanism offered linguistic and rhetorical skills that were becoming indispensable for nobles and commoners seeking careers in diplomacy and government administration, while the Renaissance ideal of the perfect gentleman was a cultural style that had great appeal in this age of growing courtly refinement. At first many who wanted a humanist education went to Italy, and many foreign names appear on the rosters of the Italian universities. By the end of the century, however, such northern cities as London, Paris, Antwerp, and Augsburg were becoming centres of humanist activity rivaling Italy’s. The development of printing, by making books cheaper and more plentiful, also quickened the diffusion of humanism.

A textbook convention, heavily armoured against truth by constant reiteration, states that northern humanism—i.e., humanism outside Italy—was essentially Christian in spirit and purpose, in contrast to the essentially secular nature of Italian humanism. In fact, however, the program of Christian humanism had been laid out by Italian humanists of the stamp of Lorenzo Valla, one of the founders of classical philology, who showed how the critical methods used to study the classics ought to be applied to problems of biblical exegesis and translation as well as church history. That this program only began to be carried out in the 16th century, particularly in the countries of northern Europe (and Spain), is a matter of chronology rather than of geography. In the 15th century, the necessary skills, particularly the knowledge of Greek, were possessed by a few scholars; a century later, Greek was a regular part of the humanist curriculum, and Hebrew was becoming much better known, particularly after Johannes Reuchlin published his Hebrew grammar in 1506. Here, too, printing was a crucial factor, for it made available a host of lexicographical and grammatical handbooks and allowed the establishment of normative biblical texts and the comparison of different versions of the Bible.

Christian humanism was more than a program of scholarship, however; it was fundamentally a conception of the Christian life that was grounded in the rhetorical, historical, and ethical orientation of humanism itself. That it came to the fore in the early 16th century was the result of a variety of factors, including the spiritual stresses of rapid social change and the inability of the ecclesiastical establishment to cope with the religious needs of an increasingly literate and self-confident laity. By restoring the gospel to the centre of Christian piety, the humanists believed they were better serving the needs of ordinary people. They attacked scholastic theology as an arid intellectualization of simple faith, and they deplored the tendency of religion to become a ritual practiced vicariously through a priest. They also despised the whole late-medieval apparatus of relic mongering, hagiology, indulgences, and image worship, and they ridiculed it in their writings, sometimes with devastating effect. According to the Christian humanists, the fundamental law of Christianity was the law of love as revealed by Jesus Christ in the Gospel. Love, peace, and simplicity should be the aims of the good Christian, and the life of Christ his perfect model. The chief spokesman for this point of view was Desiderius Erasmus, the most influential humanist of his day. Erasmus and his colleagues were uninterested in dogmatic differences and were early champions of religious toleration. In this they were not in tune with the changing times, for the outbreak of the Reformation polarized European society along confessional lines, with the paradoxical result that the Christian humanists, who had done so much to lay the groundwork for religious reform, ended by being suspect on both sides—by the Roman Catholics as subversives who (as it was said of Erasmus) had “laid the egg that Luther hatched” and by the Protestants as hypocrites who had abandoned the cause of reformation out of cowardice or ambition. Toleration belonged to the future, after the killing in the name of Christ sickened and passions had cooled.