The literary remains of Gregory, all written in Bohemian, are considerable. There are seven so-called _Letters to Rokycan_, which, though they were all undoubtedly sent to the Archbishop, were yet intended for a wider circle of readers. Two of these letters, the fourth, from which I have quoted extensively, and the sixth, were afterwards republished by Gregory in an enlarged form, the former under the title of _The Sufferings of the Brethren under King George_, the latter under that of _The Answer of the Ancient Brethren_. We have letters also addressed to other people. The form of a letter was then a very favourite one for expounding theological views. Other writings of Gregory are _The Book on Good and Evil Priests_, _On the Holy_ _Church_, and _On the Narrow Path_. A treatise, evidently dating from the first days of the Unity, and entitled _How People should Behave with regard to the Roman Church_, is also generally attributed to Gregory. Recent research renders it probable that it is not his work. It is, of course, out of place to give here an historical account of the development of the Unity, though such a work would have great interest. The brethren were, however, such indefatigable writers that it is necessary frequently to refer to the history of the community. Discord broke out among the brethren, who had already become numerous, shortly after the death of Gregory, probably about the year 1480. Matthew, who had been the nominal head of the community during Gregory's lifetime, appears to have been a well-meaning man of weak character, who became helpless after the loss of his sagacious adviser. Several different causes of discord are mentioned as appearing at about the same time. A theological controversy as to the means of salvation was indeed settled by means of a compromise proposed at one of the numerous meetings of the brethren by Brother Prokop, noticeable also as one of the theological writers of the Unity. Shortly afterwards, however, discussions as to "worldly power" led to a rupture. Gregory had, on the whole, held the opinions of Chelčicky,[81] according to which no true Christian should take part in the government of the State, nor should he take oaths or possess worldly goods. Gregory also shared Chelčicky's dislike to towns, "the foundations of Cain." These views had been strictly carried out during the first years of the Unity. The new members had, on joining the community, been obliged to despoil themselves of all worldly possessions and conform to the other doctrines of Chelčicky mentioned above.