800. Before justification, faith exists, it seems, only as an act performed under the influence of actual or transitory grace. After the infusion of habitual grace, faith is a habit or infused virtue. But there are two modes of existence characteristic of this one habit, and hence the distinction of living and dead faith (Gal., v. 6; James, ii. 26).
(a) Living faith is that which is informed or animated by charity. This latter virtue is called the soul of all the other virtues, inasmuch as it directs them to their supreme end, divine friendship, and gives meritorious value to their works. All those have living faith who join to belief a life in agreement with belief—that is, the state of grace, love of God and good works.
(b) Dead faith is that which is separated from charity. It is a true virtue, because it directs the assent of the intellect to its proper end; but it is an imperfect virtue, because its acts are not directed to the Last End, and are not meritorious of eternal life. All those who believe, but who do not live up to their belief in matters of importance, who neglect serious duties to God or others, have dead faith. Examples are those who call themselves Catholics, but neglect attendance at church and the reception of the Sacraments.
801. Those who have, or who had faith, are the following:
(a) the Angels in the state of probation and our first parents in Paradise, for faith is necessary as a means in every condition short of the beatific vision (see 785, 158); (b) those in this life who are in the friendship of God, and also those believers who are not in the friendship of God, the former having living, and the latter dead faith (see 800); (c) the souls in purgatory, the ancient patriarchs in limbo.
802. Those who have not faith are the following: (a) those who have vision of the truths of faith, that is, the Saints in heaven and Christ while on earth (I Cor., xiii. 10); (b) those who reject obstinately even one doctrine of faith, for, if individual judgment is put above the authority of God even in one point, the motive or keystone of faith, and therefore faith itself, is no longer assented to; (c) the lost, for, being cut off entirely from grace, these possess no virtue infused by God. “The devils believe and tremble” (James, ii. 19), but their belief is not supernatural or free, but natural and unwilling.
803. Of those who have faith, some have greater, and some less faith. Thus, our Lord reproved St. Peter for his little faith (Matt., xiv. 31), and praised the Woman of Canaan for her great faith (Matt., xv. 28). But since all are obliged to have supreme confidence in God and to accept all He teaches, how is there room for different degrees of faith?
(a) Faith must be supreme appreciatively, that is, all must put the formal object of faith, the motive of its assent, above every other motive of assent, for the First Truth speaking deserves more adherence than any other authority. In this respect, therefore, and in the exclusion of every doubt, the faith of all is equal. But faith need not be supreme intensively, that is, it is not required that the intellect should feel the assent of faith more than the assent given to natural truth, or that the will must experience the highest alacrity, devotion and confidence; for the truths that are nearer to us move us more vehemently than do higher and invisible truths. Hence, in this respect the faith of one may be more firm or fervent than the faith of another, according as one is more childlike, more loving, more intense in his acceptance of God’s Word than another.
(b) Faith must be universal, that is, we must accept the entire material object of revelation, and none may pick and choose according to his likes or fancies, for all of revelation has God for its Author. In this respect the faith of all is equal, all believers accepting twelve articles, while those who accept eleven or six or one or none, are not believers. But faith need not be explicit as to all its doctrines, and hence, while one believer who is not thoroughly instructed may know only the twelve articles of the Creed, another believer who is better instructed may know the hundreds of other truths that are contained in the articles. In this way the faith of one is greater extensively.
804. Can faith grow or decline in the same person? (a) If there is question of acts of faith, the later acts can be more or less firm or fervent than those that preceded, in the way explained in the previous paragraph. In this sense we may understand the Apostles to have asked of our Lord a higher degree of faith, that they might work miracles in His name (Luke, xvii. 5). (b) If there is question of the habit of faith, it itself is increased at every increase of sanctifying grace (see 745). St. Paul writes to the Corinthians (II Cor., x. 15) that he has hope of their “increasing faith.” Moreover, by repeated acts of faith the ease and delight with which the habit is exercised increases, as is the case with acquired habits. But the habit of faith is not diminished directly as was explained regarding the infused virtues in general (see 745).