 The battle against what he saw as an imperialised papacy and its supporters, the "sects", as he called the monastic orders, takes up a large space not only in his later works as the "Trialogus", "Dialogus", "Opus evangelicum", 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".