Good works are required as the means and way for possessing salvation. Even though they don't contribute anything to the acquisition of our salvation, they are necessary to the obtainment of it. No one can be saved without them.
We do not deny that the church has many functions in relation to the Scriptures. She is: (1) the keeper of the oracles of God to whom they are committed and who preserves the authentic tables of the covenant of grace with the greatest fidelity, like a notary (Rom. 3:2); (2) the guide, to point out the Scriptures and lead us to them (Is. 30:21); (3) the defender, to vindicate and defend them by separating the genuine books from the spurious, in which sense she may be called the ground of the truth (1 Tim. 3:15*); (4) the herald who sets forth and promulgates them (2 Cor. 5:19; Rom. 10:16); (5) the interpreter inquiring into the unfolding of the true sense. But all these imply a ministerial only and not a magisterial power.
The reading and contemplation of the Scriptures is enjoined upon men of all languages, therefore the translation of it into the native tongues is necessary. Since men speak different languages and are not all familiar with those two in which it was first written, it cannot be understood by them unless translated; it comes as the same thing to say nothing at all and to say what nobody can understand. But here it happens by the wonderful grace of God that the division of tongues (which formerly was the sign of a curse) becomes now the proof of a heavenly blessing. What was introduced to destroy Babel is now used to build up the mystical Zion.
It was not necessary for the apostles to write a catechism so as to deliver their doctrines professedly. It was enough for them to hand down to us those doctrines in accordance with which all symbolical books and catechisms might be constructed. If they did not formally write a catechism, they did materially leave us either in the gospels or in the epistles those things by which we can be clearly taught the principles of religion (katécheisthai).
If theology takes some things from other systems, it is not as an inferior from superiors, but as an superior from inferiors (as a mistress freely using her handmaids). Theology does not so much take from others, as presupposes certain previously known things upon which it builds revelation.
Institutes of Elenctic Theology
That God is the object of theology is evident both from the very name (theologias and theosebeias), and from Scripture which recognizes no other principal object.Institutes of Elenctic Theology
Thus that all things are discussed in theology either because they deal with God himself or have a relation (schesin) to him as the first principle and ultimate end.Institutes of Elenctic Theology
But the divine dayspring from on high is adored, Christ the Lord, who is our sun and shield; the sun of every blessing, asserting the glory of religion; the shield of the most safe protection, affording an invincible and inexpugnable guard to liberty.
Although the church is more ancient than the Scriptures formally considered (and as to the mode of writing), yet it cannot be called such with respect to the Scriptures materially considered (and as to the substance of the doctrine) because the Word of God is more ancient than the church itself, being its foundation and seed.
The 'seat of Moses' (Mt. 23:2) is not the succession in the place and office of Moses or the external court of a supreme judge to whom the authority in question belongs (for the seat of Moses was not in existence nor was any such privilege attached to it); rather it is the promulgation of the true doctrine delivered by Moses (as the ordinary gloss on Dt. 17 has it, 'The seat of Moses is wherever his doctrine is'), and the chair of Peter is wherever his doctrine is heard. So those who have been teachers of the law delivered by Moses are considered to have taught in Moses' seat, as Hilary observes (Commentarius in Matthaeum 24.1 [PL 9.1048]). Therefore the Pharisees teaching in Moses' seat were to be heard as far as they faithfully proposed to the people his doctrine, without any admixture of their own.
When the apostle says that 'faith is by hearing' (Rom. 10:17), he does indeed give us to understand that the ministry of the church ought to come in as the ordinary means of producing faith in adults. He does not teach, however, that the church is clearer and better known than the Scriptures.
To inquire concerning the number, the authors, parts and single words of the sacred books is different from inquiring concerning the fundamental doctrines contained in them. The latter knowledge pertains to every believer, but not the former. Nor will his salvation be in jeopardy who cannot tell who wrote the gospel of Matthew, provided he believes the book to be authentic and divine. The knowledge of the primary author of any book is one thing; that of the amanuensis is another. The latter belongs only to an historical faith, but the former to a divine.
Christ did not suffer eternal death but a death of three days only, and yet he fully paid the debt of everlasting punishment which we owed. His, which was one of finite duration, was equivalent to an everlasting death suffered by us, because of the infinite dignity of his person. His were the sufferings not of a mere man, but of the true God, who purchased the Church with his blood, (Acts 20:28). Hence what was deficient in duration is supplied by the divinity of the sufferer, which gave infinite importance to a temporary passion.
Though a death of infinite value was due for every individual sinner, yet such a death as Christ's is quite sufficient for the redemption of the whole elect world.
For though Christ's human nature, which was the instrument in the obedience and sufferings, was finite, yet this does not lessen the value of the satisfaction, because it derives its perfection from the divine person of Christ, to which all his actions must be attributed; as he is the person who obeyed and suffered.
The Apocryphal books are so called not because the authors are unknown (for there are some canonical books whose authors are unknown and some apocryphal books whose authors are known); not because they could be read only in private and not in public (for some of them may be read even in public), but either because they were removed from the crypt (apo tés kryptés) (that sacred place in which the holy writings were laid up) as Epiphanius and Augustine think; or because their authority was hidden and suspected, and consequently their use also was secret since the church did not apply to them to confirm the authority of ecclesiastical doctrines (as Jerome says, 'Praefatio in libros Salomonis' from "Hieronymi Prologus Galeatus" in Biblia Sacra Vulgata Editionis Sixti V ... et Celementis VIII [1865], p. lii); or, what is more probable, because they are of an uncertain and obscure origin (as Augustine says, CG 15.23* [FC 14:474]).
For a thing to be denied by philosophy is different from not being taught by it. We do not deny that various theological mysteries are not taught in philosophy, but it does not follow that they are denied by it because the limits of the two sciences must be kept distinct. The physician does not meddle with geometry, nor the lawyer with natural science. So philosophy should be kept within its proper bounds and not be allowed to thrust its pruning hook into a different field. Therefore, because it says nothing about the Trinity and the incarnation, we must not suppose that it denies these doctrines.
So God wishes us to apply all the truths of the lower sciences to theology and after rescuing them from the Gentiles (as holders of a bad faith) to take and appropriate them to Christ who is the truth, for the building of the mystic temple; as formerly Moses enriched and adorned the tabernacle with Egyptian gold, and Solomon procured the assistance of the Sidonians and Syrians in building the temple.
Philosophy is used either properly and in the abstract for the knowledge of things human and divine (as far as they can be known by the light of nature), or improperly and in the concrete for a collection of various opinions at variance with each other (which the philosophers of different sects held). In this latter sense, we acknowledge that it contains many errors and that it is of no use but of the greatest harm. Thus Paul condemns it (Col. 2:8). But in the former sense, its uses are many. In passing, we give only the more general.
On this subject men run into two extremes. Those who confound philosophy with theology err on the side of excess. This the false apostles formerly did who incorporated various unsound philosophical opinions with the Christian doctrine and are on this account rebuked by the apostle (Col. 2:8). Some of the fathers, coming out from among the philosophers, still retained some of their erroneous opinions and endeavored to bring the Gentiles over to Christianity by a mixture of philosophical and theological doctrines: as Justin Martyr, Origen, Clement of Alexandria, and the Scholastics, whose system is philosophical rather than theological since it depends more upon the reasonings of Aristotle and other philosophers than upon the testimonies of the prophets and apostles.
Theology labors to prove the existence of God not from a primary and proper intention, but, as it were, incidentally from an adventitious necessity (viz., for the purpose of confuting the profane and atheists who without shame and with seared consciences deny it). (2) The axiom —'"science does not prove its subject, but takes it for granted"—is true in human and inferior sciences, but not in theology. Theology is of a higher order for it extends itself to the proof of all things which can be proved by the means peculiar to itself (viz., by divine revelation). It does this, not instrumentally, but authoritatively.Institutes of Elenctic Theology
But when God is set forth as the object of theology, he is not to be regarded simply as God in himself (for thus he is incomprehensible [akataléptos] to us), but as revealed and as he has been pleased to manifest himself to us in his word, so that divine revelation is the formal relation which comes to be considered in this object.Institutes of Elenctic Theology