Excerpt from the Westminster Directory for Public Worship
Of the Preaching of the Word
But the servant of Christ, whatever his method be, is to perform his whole ministry:
1. Painfully, not doing the work of the Lord negligently.
2. Plainly, that the meanest may understand; delivering the truth not in the enticing words of man's wisdom, but in demonstration of the Spirit and of power, lest the cross of Christ should be made of none effect; abstaining also from an unprofitable use of unknown tongues, strange phrases, and cadences of sounds and words; sparingly citing sentences of ecclesiastical or other human writers, ancient or modern, be they never so elegant.
3. Faithfully, looking at the honor of Christ, the conversion, edification, and salvation of the people, not at his own gain or glory; keeping nothing back which may promote those holy ends, giving to every one his own portion, and bearing indifferent respect unto all, without neglecting the meanest, or sparing the greatest, in their sins.
4. Wisely, framing all his doctrines, exhortations, and especially his reproofs, in such a manner as may be most likely to prevail; showing all due respect to each man's person and place, and not mixing his own passion or bitterness.
5. Gravely, as becometh the word of God; shunning all such gesture, voice, and expressions, as may occasion the corruptions of men to despise him and his ministry.
6. With loving affection, that the people may see all coming from his godly zeal, and hearty desire to do them good. And,
7. As taught of God, and persuaded in his own heart, that all that he teaches is the truth of Christ; and walking before his flock, as an example to them in it; earnestly, both in private and public, recommending his labors to the blessing of God, and watchfully looking to himself, and the flock whereof the Lord hath made him overseer: So shall the doctrine of truth be preserved without corruption, many souls converted and built up, and himself receive manifold comforts of his labors even in this life, and afterward the crown of glory laid up for him in the world to come.
Where there are more ministers in a congregation than one, and they of different gifts, each may more especially apply himself to doctrine or exhortation, according to the gift wherein he most excels, and as they shall agree between themselves.