'The difference in the sandal sets forth a difference in the minister. The offices of the priest and of the bishop are almost identical; but because there is a distinction in their titles and honours there is a distinction in their sandals, that we may not fall into error upon beholding them, which we might well do, owing to the similarity of their offices. The bishop has a band (_ligatura_) in his sandals, which the presbyter has not. It is the duty of the bishop to travel throughout the length and breadth of his diocese (_parochia_) to govern the inhabitants; and lest they should fall from his feet, his sandals are bound. The moral of this is, that he who mingles with the vulgar crowd must secure fast the courses of his mind (_gressus mentis_). The priest, who remains in one spot and offers the sacrifice there, walks more securely. The deacon, because his office is different from that of the bishop, needs not different sandals; he therefore wears them bound, because it is his to go on attendance. The subdeacon, because he assists the deacon, and has almost the same office, must have different sandals, that he be not thought a deacon. The inner meaning is this: Because the sandals set forth the way of the preacher, the sole, which is underneath, warns the preacher not to mingle with earthly matters. The tongue of white leather, which is under the "tread"[56] of the foot, shows that there ought to be the same separation, guiltless and guileless; that it may be said of him, "Behold an Israelite indeed, in whom there is no guile;" let him not be such as were the false apostles, who preached in malice and disputation. The tongue, which rises thence, and is separated from the leather of the sandals, sets forth the tongue of those who ought to bear good testimony to the preacher, of whom Paul said, "He must have a good report of them that are without." These are in the lower rank, and to some extent are separated from spiritual intercourse. The upper tongue is the tongue of the spirits (_spiritalium_), who lead the preacher into the work of preaching. These search into the past life of the preacher. But the sandals are bound round within with white leather; so must the desire of the preacher be pure before God, out of a clean conscience; and without appears the black, since the life of the preacher seems despised by them that are worldly on account of the myriad afflictions of this present life. The upper part of the sandal, through which the foot enters, is sewn together with many threads, that the two leather bands be not separated; for at first the preacher should apply himself to the many virtues and sayings of the Scriptures, that his outward acts may not be at variance with those which are secret and known to God only. The tongue of the sandals, which is over the foot, sets forth the tongue of the preacher. The line made by the craft of the shoemaker, stretching from the tongue