The very essence of Christianity is cast to the winds when Knox utters his laughter over the murders or misfortunes of his opponents, yielding, as Dr.M'Crie says, "to the strong propensity which he felt to indulge his vein of humour." Other good men rejoiced in the murder of an enemy, but Knox chuckled.
Nothing has injured Knox more in the eyes of posterity (when they happen to be aware of the facts) than this "humour" of his.
Knox might be pardoned had he merely excused the murder of "the devil's own son," Cardinal Beaton, who executed the law on his friend and master, George Wishart.

To Wishart Knox bore a tender and enthusiastic affection, crediting him not only with the virtues of charity and courage which he possessed, but also with supernormal premonitions; "he was so clearly illuminated with the spirit of prophecy." These premonitions appear to have come to Wishart by way of vision.

Knox asserted some prophetic gift for himself, but never hints anything as to the method, whether by dream, vision, or the hearing of voices.

He often alludes to himself as "the prophet," and claims certain privileges in that capacity.
For example the prophet may blamelessly preach what men call "treason," as we shall see.

As to his actual predictions of events, he occasionally writes as if they were mere deductions from Scripture.