He says quite seriously, and this may very well be true, that what he was wont to hear at times outside the monastery from unbelieving “grammarians,” i.e. humanists, regarding the great difference between the teaching of Holy Scripture and that of the existing Church, made a deep impression on him.[57] He had, however, calmed himself, so he says, with the thought that this was other people’s business. In the monastic library he once came across some sermons of John Hus. Their contents appeared to him excellent, nevertheless, so he writes, from aversion for the author’s name, he laid aside the book without reading any further, though not without surprise that such a man should have written in many ways so well and so correctly. Johann Grefenstein, his master at Erfurt, had once let fall the remark in his presence that Hus had been put to death without any previous attempt being made to instruct or convert him. At that time, Hus failed to make any impression on him. Doubts, however, assaulted him in the shape of temptations. Those he repulsed, well aware of the danger. In June, 1521, writing at the Wartburg, he says that more than ten years before, much that was taught by Popes, Councils and Universities had appeared to him absurd and in contradiction with Christ, but that he had put a bridle on his thoughts in accordance with the Proverb of Solomon: “Lean not upon thy own prudence.”[58] Certain it is that his clear mind must early have perceived that the Church of that day fell far short of the ideal, and it is possible that even in those early years, such a perception may have awakened in him doubts and discontent and have led him to take a too gloomy view of the state of the Church. In any case, Luther’s own testimony as given above leads us to suspect the presence in his mind at an early date of a deep-seated dissatisfaction which foreboded ill to the monk’s future fidelity to the Church.[59]