The Sufficiency of Scripture
We believe that this Holy Scripture fully contains the will of God and that everything one must believe to be saved is sufficiently taught in it.1 The whole manner of worship which God requires of us is written in it at length. It is therefore unlawful for any one, even an apostle, to teach otherwise than we are now taught in Holy Scripture, even if it be an angel from heaven.2 For since it is forbidden to add to or subtract from the Word of God,3 this plainly demonstrates that the teaching is perfect and complete in all respects.
Therefore we must not consider human writings, no matter how holy their authors may have been, equal to the divine writings; nor may we put custom, nor the majority, nor age, nor the passage of time or persons, nor councils, decrees, or official decisions above the truth of God, for truth is above everything else.4 For all mankind is by nature liars5 and utterly vain.6 Therefore we reject with all our hearts everything that does not agree with this infallible rule, as we are taught to do by the apostles when they say, "Test the spirits to see whether they are from God,"7 and also, "If anyone comes to you and does not bring this teaching, do not receive him into your house."8