781. Summary of the Twelfth Article: “Life everlasting.”—Those who die in the friendship of God will be received into unending happiness, in which they will be exempted from all evil and enjoy the beatific vision and other divine gifts.
782. The Acts of Faith.—According to St. Paul, there are two acts of faith, one internal, the other external: “With the heart we believe unto justice, but with the mouth confession is made unto salvation” (Rom., x. 10). (a) The internal act of faith is the firm and constant judgment of the intellect assenting to divine revelation (II Cor., x. 5), but freely and under the command of the will (Mark, xvi. 16), being moved thereto by divine grace (Eph., ii. 5). (b) The external act of faith is the profession before the world by signs, such as words or deeds, of the internal assent given to divine revelation.
783. The internal act of faith is one, but it has a threefold relationship: (a) it believes about God, if we consider the intellect as assenting to the material object; (b) it believes God, if we consider the intellect as assenting to the formal object; (c) it believes in God, if we consider the will as moving the intellect to assent, and tending towards God as the Last End.
784. The truths to which the assent of faith is given are either supernatural or natural. (a) Supernatural truths or mysteries (e.g., the Trinity of Persons in God) are revealed for faith, that man may know, desire and work for the supernatural destiny to which he has been raised. (b) Natural truths (e.g., the Oneness of God) are revealed for faith, so that mankind may obtain more quickly, more generally, and more certainly the knowledge of divine things which reason can afford. It is impossible, however, that an act of faith and an act of knowledge should coexist in the same individual about the same truth, for faith is of things that appear not.
785. The act of faith is a necessary preliminary to other supernatural acts, for we do not tend towards the supernatural, unless we first accept it by belief; hence, faith is necessary. But the act of faith may also be made after other supernatural acts, like those of hope and charity; and so it may be meritorious. (a) The act of faith is necessary, both as a means and as a precept (see 360). The necessity of means will be treated now, the necessity of precept later, when we speak of the commandments of faith (see 913 sqq.). (b) The act of faith before justification is meritorious congruously and in a wide sense; but after justification it has condign merit (see 110).
786. For all adults the act of faith is necessary for salvation as a necessity of means (see 360), for the Apostle says: “Without faith it is impossible to please God” (Heb., xi. 6). The truths which must be believed under necessity of means are of two kinds. (a) One must believe with implicit faith all revealed truths which one does not know and is not bound to know. An act of implicit faith is contained in the formula: “O my God, I firmly believe all the truths the Catholic Church teaches, because Thou hast revealed them.” (b) One must believe with explicit faith all the truths which one is bound to know. An act of explicit faith in all the truths necessary by necessity of means is contained in the Apostles’ Creed. Other truths that must be explicitly believed on account of a necessity of precept will be discussed in 918, 920.
787. What specifically are the truths just referred to that all are bound to know as a necessary means? (a) Theologians generally agree that it has always been necessary for adults to know and accept two basic mysteries—God’s existence, as the supernatural End or happiness of man, and His providence as exercised in supplying the means necessary for supernatural salvation (see 768). Without such belief, supernatural hope and charity, at all times necessary, are impossible. (b) A majority of theologians hold, and with greater probability it seems, that since the promulgation of the Gospel it is necessary for adults to know and accept the two basic mysteries of Chrisitanity— viz., that in God, who is our beatitude, there are three persons (the Trinity), and that the way to our beatitude is through Christ our Redeemer (the Incarnation).
788. Even before the Gospel, it was always necessary as a means that one believe explicitly in God as our supernatural happiness and as the provider of the means thereto. Thus, the Apostle, speaking of the ancient patriarchs, says: “He that cometh to God, must believe that He is, and is a rewarder to them that seek Him” (Heb., xi. 6). He that would come to God (i.e., be saved), must believe in God as the Author of glory and of grace. Hence, one must believe: (a) that God exists, who is not ashamed to be called our God, and who prepares for us a better, that is, a heavenly country (Heb., xi. 6); (b) that God is a remunerator, from whom must be expected the working out of His promises and the helps to attain the reward, as well as the meting out of justice. In this faith is included implicitly a faith in Christ, and thus in the Old Testament a belief, at least implicit, in the Messiah to come was always necessary: “Man is not justified by the works of the law, but by the faith of Jesus Christ” (Gal., ii. 16).
789. Since the promulgation of the Gospel (see 342, 354), it is also necessary as a means that one believe explicitly in the mysteries of the Trinity and Incarnation. For he who does not accept these, does not accept the Gospel, whereas Christ says: “Go ye into the whole world, and preach the Gospel to every creature. He that believeth not shall be condemned” (Mark, xvi. 15, 16).
(a) Theoretically, this opinion seems more probable than the opposite opinion; but chiefly on account of the difficulty about negative infidels, which is discussed in dogmatic treatises on Predestination and Grace, many theologians either reject it (e.g., those who say that belief in the two great Christian mysteries is necessary only as a precept, or that implicit faith suffices), or modify it (e.g., those who say that belief in these two mysteries is not necessary as a means for justification, but only for glorification, and those who say that regularly such faith is a necessary means, but that an exception is allowed for invincible ignorance, or for the insufficient promulgation of the Gospel in many regions).