It is abundantly clear that this primitive dignitary was ordinarily the pastor of only a single congregation.  “If, before the multitude increase, there should be a place having a few faithful men in it, to the extent of twelve, who shall be able to make a dedication to pious uses for a bishop, let them write to the Churches round about the place,” says an ancient canon, “that three chosen men.... may come to examine with diligence him who has been thought worthy of this degree....  If he has not a wife, it is a good thing; but if he has married a wife, having children, let him abide with her, continuing steadfast in every doctrine, able to explain the Scriptures well.” [576:1] This humble functionary was assisted in the management of his little flock by two or three elders.  “If the bishop has attended to the knowledge and patience of the love of God,” says another regulation, “let him ordain two presbyters, when he has examined them, or rather three.” [576:2] The bishop, the elders, and the deacons, all assembled in one place every Lord’s day for congregational worship.  An old ecclesiastical law accordingly prescribes the following arrangement—­“Let the seat of the bishop be placed in the midst, and let the presbyters sit on each side of him, and let the deacons stand by them,... and let it be their care that the people sit a with all quietness and order in the other part of the church.” [576:3] Thus, except in the case of a few large towns, the primitive bishop was simply the parochial minister.  Towards the close of the second century, the bishop and the teacher were designations of the same import.  Speaking of those at the head of the Churches, Irenaeus describes them as distinguished by their superior or inferior ability in sermonizing; [576:4] and a well-informed writer, who flourished as late as the fourth century, mentions preaching as the bishop’s peculiar function. [576:5] In the apostolic age every one who had popular gifts was permitted to edify the congregation by their exercise; [576:6] and, long afterwards, any elder, who was qualified to speak in the Church, was at liberty to address his fellow-worshippers.  When Origen, prior to his ordination as a presbyter, ventured to expound the Scriptures publicly at the request of the bishops of Palestine, Demetrius, his own ecclesiastical superior, denounced his conduct as irregular; but the parties, by whom the learned Alexandrian had been invited to lecture, boldly vindicated the proceeding.  He (Demetrius) has asserted, said they, “that this was never before either heard or done, that laymen should deliver discourses in the presence of bishops.  We know not how it happens that he is here evidently so far from the truth.  For, indeed, wherever there are found those qualified to benefit the brethren, they are exhorted by the holy bishops to address the people.” [577:1] But still the bishop himself was the stated and ordinary preacher; and when he was sick or absent, the flock could seldom expect a sermon.  When present, he always administered the Lord’s Supper with his own hands, and dispensed in person the rite of baptism.  He also occupied the chair at the meetings of the presbytery, and presided at the ordination of the elders and deacons of his congregation.