Rabanus Maurus
Catena Aurea · Matthäusevangelium 23
But all their works they do for to be seen of men: they make broad their phylacteries, and enlarge the borders of their garments, And love the uppermost rooms at feasts, and the chief seats in the synagogues, And greetings in the markets, and to be called of men, Rabbi, Rabbi. But be not ye called Rabbi: for one is your Master, even Christ; and all ye are brethren. And call no man your father upon the earth: for one is your Father, which is in heaven. Neither be ye called masters: for one is your Master, even Christ. But he that is greatest among you shall be your servant. And whosoever shall exalt himself shall be abased; and he that shall humble himself shall be exalted.
It should be noted, that He does not forbid those to whom this belongs by right of rank to be saluted in the forum, or to sit or recline in the highest room; but those who unduly desire these things, whether they obtain them or not, these He enjoins the believers to shun as wicked.