I say [the hidden man] of the heart. For neither does religion consist Orthodoxy, or right opinions; which, although they are not properly outward things, are not in the heart, but the understanding. A man may be orthodox in every point; he may not only espouse right opinions, but zealously defend them against all opposers; he may think justly concerning the incarnation of our Lord, concerning the ever-blessed Trinity, and every other doctrine contained in the oracles of God; he may assent to all the three creeds, — that called the Apostles’, the Nicene, and the Athanasian; and yet it is possible he may have no religion at all, no more than a Jew, Turk, or pagan. He may be almost as orthodox — as the devil, (though, indeed, not altogether; for every man errs in something; whereas we can’t well conceive him to hold any erroneous opinion,) and may, all the while be as great a stranger as he to the religion of the heart.       —from SERMON 7: THE WAY TO THE KINGDOM

Upon my orthodoxy, or right opinions, which, by a gross abuse of words, I have called faith [that faith which i am saved by]? Upon my having a set of notions, suppose more rational or scriptural than others have?” Alas! what madness is this! Surely this is building on the sand, or, rather, on the froth of the sea! Say, “I am convinced of this: Am I not again building my hope on what is equally unable to support it? Perhaps on my belonging to “so excellent a church; reformed after the true Scripture model; blessed with the purest doctrine, the most primitive liturgy, the most apostolical form of government!” These are, doubtless, so many reasons for praising God, as they may be so many helps to holiness; but they are not holiness itself: And if they are separate from it, they will profit me nothing; nay, they will leave me the more without excuse, and exposed to the greater damnation. Therefore, if I build my hope upon this foundation, I am still building upon the sand.         —from SERMON 33: UPON OUR LORD’S SERMON ON THE MOUNT (XIII)

When things of an indifferent nature are represented as necessary to salvation, it is a folly of the same kind, though not of the same magnitude. Indeed, it is not a little sin to represent trifles as necessary to salvation; such as going of pilgrimages, or anything that is not expressly enjoined in the Holy Scripture. Among these we may undoubtedly rank orthodoxy, or right opinions. We know, indeed, that wrong opinions in religion naturally lead to wrong tempers, or wrong practices; and that, consequently, it is our bounden duty to pray that we may have a right judgment in all things. But still a man may judge as accurately as the devil, and yet be as wicked as he.                                   —from SERMON 7: THE WAY TO THE KINGDOM