We believe that these Holy Scriptures fully contain the will of God, and that whatsoever man ought to believe unto salvation, is sufficiently taught therein. For since the whole manner of worship which God requires of us is written in them at large, it is unlawful for any one, though an Apostle, to teach otherwise than we are now taught in the Holy Scriptures; nay, though it were an angel from, heaven, as the Apostle Paul saith. For since it is forbidden to add unto or take away any thing from the Word of God, it doth thereby evidently appear that the doctrine thereof is most perfect and complete in al respects. Neither may we compare any writings of men, though ever so holy, with those divine Scriptures; nor ought we to compare custom, or the great multitude, or antiquity, or succession of times or persons, or councils, decrees, or statutes, with the truth of God, for the truth is above all: for all men are of themselves liars, and more vain than vanity itself. Therefore we reject with all our hearts whatsoever doth not agree with this infallible rule, which the Apostles have taught us, saying, Try the spirits whether they are of God; likewise, If there come any unto you, and bring not this doctrine, receive him not into your house.
—Belgic Confession Art. 7 in Philip Schaff, The Creeds of Christendom, with a History and Critical Notes: The Evangelical Protestant Creeds, with Translations, vol. 3 (New York: Harper & Brothers, 1882), 389.