“That traditions of men should be obtruded unto us for articles of religion, and admitted for parts of God’s worship; or that any traditions should be accepted for parcels of God’s Word, beside the holy Scriptures, and such doctrines as are either expressly therein contained, or by sound inference may be deduced from thence; I think we have reason to gainsay; as long as, for the first, we have this direct sentence from God Himself, In vain do they worship Me, teaching for doctrines the commandments of men; and for the second, the express warrant of the Apostle, (2 Tim. 3:16,) testifying of the holy Scriptures, not only that they are “able to make us wise unto salvation,” (which they should not be able to do, if they did not contain all things necessary to salvation); but also that by them the man of God, that is, the Minister of God’s Word, unto whom it appertaineth to declare “all the counsel of God,” may be “perfectly instructed to every good work;” which could not be, if the Scriptures did not contain all the counsel of God, which was fit for him to learn, or if there were any other word of God, which he were bound to teach, that should not be contained within the limits of the Book of God. Ps. 19:7-10; Rev. 22:18,19.”
~James Ussher, Answer to a Jesuit, c. 2.
HT and Source: https://ilyston.wordpress.com/2015/01/20/regulative-principle-by-james-ussher/ (blog no longer available)