John Wycliffe and in his sermons, but also in a series of sharp tracts and polemical productions in Latin and English (of which those issued in his later years have been collected as "Polemical Writings"). In the 1380 "Objections to Friars", he calls monks the pests of society, enemies of religion, and patrons and promoters of every crime. He directed his strongest criticism against the friars, whose preaching he considered neither scriptural nor sincere, but motivated by "temporal gain". While others were content to seek the reform of particular errors and abuses, Wycliffe sought nothing less than the extinction of the institution
John Wycliffe of Wycliffe toward Kynyngham is that of a junior toward an elder whom one respects, and he handled other opponents in similar fashion. Wycliffe earned his great repute as a philosopher at an early date. Henry Knighton says that in philosophy he was second to none, and in scholastic discipline incomparable. There was a period in his life when he devoted himself exclusively to scholastic philosophy: "when I was still a logician," he used later to say. The first "heresy" which "he cast forth into the world" rests as much upon philosophical as upon theological grounds. In Plato, knowledge of