Matthew 23:8

And in the Church of Christ are found some who take to themselves the uppermost places, that is, become deacons; next they aspire to the chief seats of those that are called presbyters; and some intrigue to be styled among men Bishop, that is, to be called Rabbi. But Christ's disciple loves the uppermost place indeed, but at the spiritual banquet, where he may feed on the choicer morsels of spiritual food, for, with the Apostles who sit upon twelve thrones, he loves the chief seats, and hastes by his good works to render himself worthy of such seats; and he also loves salutations made in the heavenly market-place, that is, in the heavenly congregations of the primitive. But the righteous man would be called Rabbi, neither by man, nor by any other, because there is One Master of all men.

The other things then He carried no further than to accuse them, as being small and trifling, and as though His disciples needed not at all to be corrected about these matters; but what was a cause of all the evils, even ambition, and the violent seizing of the teacher's chair, this He brings forward, and corrects with diligence, touching this vehemently and earnestly charging them. For what saith He? "But be not ye called Rabbi." Then follows the cause also; "For one is your master, and all ye are brethren;" and one hath nothing more than another, in respect of his knowing nothing from himself. Wherefore Paul also saith, "For who is Paul, and who is Apollos, but ministers?" He said not masters.

(cont. Helvid. 15.) All men may be called brethren in affection, which is of two kinds, general and particular. Particular, by which all Christians are brethren; general, by which all men being born of one Father are bound together by like tie of kindred.

Be not ye called Rabbi, that ye take not to yourselves what belongs to God. And call not others Rabbi, that ye pay not to men a divine honour. For One is the Master of all, who instructs all men by nature. For if man were taught by man, all men would learn that have teachers; but seeing it is not man that teaches, but God, many are taught, but few learn. Man cannot by teaching impart an understanding to man, but that understanding which is given by God man calls forth