Hold fast the form of sound words,.... By "words" are meant, not mere words, but doctrines; for the servants of the Lord should not strive about words, to no profit, or be too tenacious of them. Indeed when words have long obtained, and have been very useful to convey just ideas of truth to the mind, they are not to be easily parted with, though they are not syllabically expressed in Scripture, unless other and better words can be substituted in their room; and especially they are to be tenaciously abode by, when the apparent design by dropping or changing them is to set aside the truths signified by them; such as trinity, unity, essence, person, imputed righteousness, satisfaction, &c.
But here words design doctrines, the words of faith and good doctrine, the wholesome words of our Lord Jesus Christ; and which are said to be "sound", in opposition to the words and doctrines of false teachers, which are corrupt and unsound, and are pernicious, and eat as do a canker; and because they are so in themselves; they are not only sweet and pleasant, but salutary and nourishing; they are milk for babes, and meat for strong men; they are food for faith, and nourish up to eternal life.
The "form" of them either intends the manner of teaching them, which should be it, apt and acceptable words, plain and easy to be understood, and not with the enticing words of men's wisdom; or a brief summary, a compendium of Gospel truth.
It was usual with both Jews and Christians to reduce the principles of their religion into a narrow compass, into a short form or breviary. The Jew had his "form of knowledge, and of the truth in the law", Ro 2:20, which was a rule to himself, and an instruction to others; and such a form, or Jewish creed, may be seen in Heb 6:1.
The Apostle Paul gives a summary of the Gospel, which he preached, and which he reduces to two heads; repentance towards God, and faith towards our Lord Jesus Christ, Ac 20:20 and an excellent compendium and abridgment of the Gospel, and a glorious form of sound words, we have in Ro 8:29 and such an one Timothy had heard and received from the apostle, as a "pattern" for him hereafter to preach by, as this word signifies; and as it is rendered in 1Ti 1:16.
There seems to be an allusion to painters, who first make their outlines, and take a rough draught before they lay on their colours and beautiful strokes; and which rough draught and first lines are the rule and pattern of their after work; and which they never exceed, but keep within the compass of: so there is a set of Gospel truths, which may be called the analogy or proportion of faith, which are a rule and pattern, as for hearers to judge by, so for ministers to preach according to, 1Ti 6:3 And such a form or pattern was the apostle's doctrine to Timothy, and which he full well knew: and this form includes the doctrines concerning the trinity of persons in the Godhead, Father, Son, and Spirit, and the proper deity and distinct personality of each of them; concerning the everlasting love of the three Persons to the elect, the covenant of grace, and the transactions in it relating to them; their personal and eternal election in Christ, and his suretyship engagements for them; the state and condition of men by the fall, and through, sin, as that Adam's sin is imputed to all his posterity, and a corrupt nature propagated from him, and that man is altogether impure, and entirely impotent all that is spiritually good; as also such doctrines as concern particular redemption by Christ, satisfaction for sin by his sacrifice, free and full pardon by his blood, and justification by his imputed righteousness: regeneration and sanctification by the powerful and efficacious grace of the Spirit of God; and the final perseverance of the saints to eternal glory, as the free gift of God.
And this is a form never to departed from, but to be held fast, as Timothy is exhorted; which supposes that he had it, as he had, not only in his head, but in his heart; and that there was danger of dropping it through the temptations that surrounded him, the reproach and persecution the Gospel lay under, and through the sleight of false teachers, who lay in wait to deceive, and to take every opportunity of wringing it out of his hands; and therefore it became him, as he had it, not only to hold it forth, and publish it, but to hold it fast, in opposition to any wavering about it, or cowardice in it, or departure from it in any degree.