An account in general of the nature and design of the ensuing discourse, with the reasons why it is made public at this time, being given in the first chapter of the treatise itself, I shall not long detain the readers here at the entrance of it. But some few things it is necessary they should be acquainted withal, and that both as to the matter contained in it and as to the manner of its handling. The subject-matter of the whole, as the title and almost every page of the book declare, is, the Holy Spirit of God and his operations. And two things there are which, either of them, are sufficient to render any subject either difficult on the one hand, or unpleasant on the other, to be treated of in this way, both which we have herein to conflict withal: for where the matter itself is abstruse and mysterious, the handling of it cannot be without its difficulties; and where it is fallen, by any means whatever, under public contempt and scorn, there is an abatement of satisfaction in the consideration and defence of it. Now, all the concernments of the Holy Spirit are an eminent part of the “mystery” or “deep things of God;” for as the knowledge of them doth wholly depend on and is regulated by divine revelation, so are they in their own nature divine and heavenly, — distant and remote from all things that the heart of man, in the mere exercise of its own reason or understanding, can rise up unto. But yet, on the other hand, there is nothing in the world that is more generally despised as foolish and contemptible than the things that are spoken of and ascribed unto the Spirit of God. He needs no furtherance in the forfeiture of his reputation with many, as a person fanatical, estranged from the conduct of reason, and all generous principles of conversation, who dares avow an interest in His work, or take upon him the defence thereof. Wherefore, these things must be a little spoken unto, if only to manifest whence relief may be had against the discouragements wherewith they are attended.
For the first thing proposed, it must be granted that the things here treated of are in themselves mysterious and abstruse. But yet, the way whereby we may endeavour an acquaintance with them, “according to the measure of the gift of Christ unto every one,” is made plain in the Scriptures of truth. If this way be neglected or despised, all other ways of attempting the same end, be they never so vigorous or promising, will prove ineffectual. What belongs unto it as to the inward frame and disposition of mind in them who search after understanding in these things, what unto the outward use of means, what unto the performance of spiritual duties, what unto conformity in the whole soul unto each discovery of truth that is attained, is not my present work to declare, nor shall I divert thereunto. If God give an opportunity to treat concerning the work of the Holy Spirit, enabling us to understand the Scriptures, or the mind of God in them, the whole of this way will be at large declared.
At present, it may suffice to observe, that God, who in himself is the eternal original spring and fountain of all truth, is also the only sovereign cause and author of its revelation unto us. And whereas that truth, which originally is one in him, is of various sorts and kinds, according to the variety of the things which it respects in its communication unto us, the ways and means of that communication are suited unto the distinct nature of each truth in particular. So the truth of things natural is made known from God by the exercise of reason, or the due application of the understanding that is in man unto their investigation; for “the things of a man knoweth the spirit of a man that is in him.” Neither, ordinarily, is there any thing more required unto that degree of certainty of knowledge in things of that nature whereof our minds are capable, but the diligent application of the faculties of our souls, in the due use of proper means, unto the attainment thereof. Yet is there a secret work of the Spirit of God herein, even in the communication of skill and ability in things natural, as also in things civil, moral, political, and artificial; as in our ensuing discourse is fully manifested. But whereas these things belong unto the work of the old creation and the preservation thereof, or the rule and government of mankind in this world merely as rational creatures, there is no use of means, no communication of aids, spiritual or supernatural, absolutely necessary to be exercised or granted about them. Wherefore, knowledge and wisdom in things of this nature are distributed promiscuously among all sorts of persons, according to the foundation of their natural abilities, and a superstruction thereon in their diligent exercise, without any peculiar application to God for especial grace or assistance, reserving still a liberty unto the sovereignty of divine Providence in the disposal of all men and their concerns.