The following is taken from the Directory for Public Worship (1645) as approved for use in the Church of Scotland. I commend it to the reading of any who have are called upon to preach the word of God. It is an excellent primer in homiletics; while it is not exhaustive, it provides a great foundation for anyone who finds himself serving as a minister of the Word:
PREACHING of the word, being the power of God unto salvation, and one of the greatest and most excellent works belonging to the ministry of the gospel, should be so performed, that the workman need not be ashamed, but may save himself, and those that hear him.
It is presupposed, (according to the rules for ordination,) that the minister of Christ is in some good measure gifted for so weighty a service, by his skill in the original languages, and in such arts and sciences as are handmaids unto divinity; by his knowledge in the whole body of theology, but most of all in the holy scriptures, having his senses and heart exercised in them above the common sort of believers; and by the illumination of God's Spirit, and other gifts of edification, which (together with reading and studying of the word) he ought still to seek by prayer, and an humble heart, resolving to admit and receive any truth not yet attained, whenever God shall make it known unto him. All which he is to make use of, and improve, in his private preparations, before he deliver in public what he hath provided.
Ordinarily, the subject of his sermon is to be some text of scripture, holding forth some principle or head of religion, or suitable to some special occasion emergent; or he may go on in some chapter, psalm, or book of the holy scripture, as he shall see fit.
Let the introduction to his text be brief and perspicuous, drawn from the text itself, or context, or some parallel place, or general sentence of scripture.
If the text be long, (as in histories or parables it sometimes must be,) let him give a brief sum of it; if short, a paraphrase thereof, if need be: in both, looking diligently to the scope of the text, and pointing at the chief heads and grounds of doctrine which he is to raise from it.
In analysing and dividing his text, he is to regard more the order of matter than of words; and neither to burden the memory of the hearers in the beginning with too many members of division, nor to trouble their minds with obscure terms of art.
In raising doctrines from the text, his care ought to be, First, That the matter be the truth of God. Secondly, That it be a truth contained in or grounded on that text, that the hearers may discern how God teacheth it from thence. Thirdly, That he chiefly insist upon those doctrines which are principally intended; and make most for the edification of the hearers.
The doctrine is to be expressed in plain terms; or, if any thing in it need explication, it is to be opened, and the consequence also from the text cleared. The parallel places of scripture, confirming the doctrine, are rather to be plain and pertinent, than many, and (it need be) some what insisted upon, and applied to the purpose in hand.
The arguments or reasons are to be solid, and, as much as may be, convincing. The illustrations, of what kind soever, ought to be full of light, and such as may convey the truth into the hearer's heart with spiritual delight.
If any doubt obvious from scripture, reason, or prejudice of the hearers, seem to arise, it is very requisite to remove it, by reconciling the seeming differences, answering the reasons, and discovering and taking away the causes of prejudice and mistake. Otherwise it is not fit to detain the hearers with propounding or answering vain or wicked cavils, which, as they are endless, so the propounding and answering of them doth more hinder than promote edification.
He is not to rest in general doctrine, although never so much cleared and confirmed, but to bring it home to special use, by application to his hearers: which albeit it prove a work of great difficulty to himself, requiring much prudence, zeal, and meditation, and to the natural and corrupt man will be very unpleasant; yet he is to endeavour to perform it in such a manner, that his auditors may feel the word of God to be quick and powerful, and a discerner of the thoughts and intents of the heart; and that, if any unbeliever or ignorant person be present, he may have the secrets of his heart made manifest, and give glory to God.
In the use of instruction or information in the knowledge of some truth , which is a consequence from his doctrine, he may (when convenient) confirm it by a few firm arguments from the text in hand, and other places of scripture, or from the nature of that common-place in divinity, whereof that truth is a branch.
In confutation of false doctrines, he is neither to raise an old heresy from the grave, nor to mention a blasphemous opinion unnecessarily: but, if the people be in danger of an error, he is to confute it soundly, and endeavour to satisfy their judgments and consciences against all objections.
In exhorting to duties, he is, as he seeth cause, to teach also the means that help to the performance of them.
In dehortation, reprehension, and publick admonition, (which require special wisdom,) let him, as there shall be cause, not only discover the nature and greatness of the sin, with the misery attending it, but also shew the danger his hearers are in to be overtaken and surprised by it, together with the remedies and best way to avoid it.
In applying comfort, whether general against all temptations, or particular against some special troubles or terrors, he is carefully to answer such objections as a troubled heart and afflicted spirit may suggest to the contrary. It is also sometimes requisite to give some notes of trial, (which is very profitable, especially when performed by able and experienced ministers, with circumspection and prudence, and the signs clearly grounded on the holy scripture,) whereby the hearers may be able to examine themselves whether they have attained those graces, and performed those duties, to which he exhorteth, or be guilty of the sin reprehended, and in danger of the judgments threatened, or are such to whom the consolations propounded do belong; that accordingly they may be quickened and excited to duty, humbled for their wants and sins, affected with their danger, and strengthened with comfort, as their condition, upon examination, shall require.
And, as he needeth not always to prosecute every doctrine which lies in his text, so is he wisely to make choice of such uses, as, by his residence and conversing with his flock, he findeth most needful and seasonable; and, amongst these, such as may most draw their souls to Christ, the fountain of light, holiness, and comfort.
This method is not prescribed as necessary for every man, or upon every text; but only recommended, as being found by experience to be very much blessed of God, and very helpful for the people's understandings and memories.
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 honour 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; shewing 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 teacheth is the truth of Christ; and walking before his flock, as an example to them in it; earnestly, both in private and publick, recommending his labours 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 uncorrupt, many souls converted and built up, and himself receive manifold comforts of his labours 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 excelleth, and as they shall agree between themselves.