805. The means of growing in faith are: (a) prayer to the Father of lights: “Lord, increase our faith” (Luke, xvii. 5); (b) reading of the scriptures, the Lives of the Saints and other similar works, and attendance at spiritual instructions; (c) frequent acts of faith in the world we see not and its coming rewards; (d) exercise of faith, by directing our thoughts, words, and actions according to the teaching of faith, rather than according to the maxims of the world; for “the just man liveth by faith” (Heb., x. 38), and “faith without works is dead” (James, ii. 20).
806. The cause of faith is God. (a) It is God who directly through revelation, or indirectly through the Church, the evangelists, preachers, etc., “brings the message before man” (Rom., x. 15); (b) it is God who “causes the mind of man to assent” to His message. No matter how persuasive the teacher or how well disposed or learned the hearer may be, faith will not come unless the light of grace leads the way (Eph., ii. 8).
807. The effects of faith are fear of God and purification of the heart. (a) Dead faith causes one to fear the penalties of divine justice, that is, to have servile fear (James, ii. 19): living faith causes one to fear sin itself, that is, to have filial fear. (b) Faith, by elevating man to higher things, purifies his soul from the defilements of lower things (Acts, xv. 9): if faith is dead, it at least purifies the intellect from error; if it is living, it also purifies the will from evil.
808. The Gifts of Understanding and Knowledge.—As was said above (see 159), the Gifts of the Holy Ghost are intended as means for perfecting the theological virtues. There are two Gifts that serve the virtue of faith, namely, the Gifts of Understanding and Knowledge.
(a) Faith, being assent, must have a right idea of what is proposed for acceptance; but, as it is obscure (see 799), and as there are things apart from faith that may corrupt our notion of it, the Gift of Understanding is conferred, a simple perception and divine intuition through which one receives a correct notion of the mysteries of faith.
(b) Faith, being the starting point of all supernatural activities, must be the norm by which we judge of what we should think and do in the affairs of life; but, as it is a simple act of assent (see 799) and as the creatures of the world are a temptation and a snare (Wis., xiv. 11), the Gift of Knowledge is given, through which one receives a correct judgment about the things of this world. These then take on a new and fuller significance in the light of the teachings of faith.
809. The Gift of Understanding must not be confused with the Beatific Vision. (a) A perfect penetration of the mysteries, which enables one to perceive their essence and causes (e.g., the how and the why of the Trinity), is given by the Beatific Vision; but such understanding removes all obscurity, and is therefore insociable with faith. (b) An imperfect penetration of the teachings of faith, which does not take away the obscurity and mysteriousness, is given by the Gift of Understanding, and is therefore sociable with faith. The effects of this Gift are: it distinguishes the truths of faith from false doctrines; it conveys a clear view of the credibility of the mystery of faith against all difficulties and objections; it gives knowledge of the supernatural import of the secondary truths of faith, that is, of those revealed happenings and facts that are not themselves supernatural (Luke, xxiv. 32); it gives understanding of the practical aspect of a mystery—for example, that the intratrinitarian relations of the Divine Persons are a model for the regulation of the Christian life, in knowledge and love of divine things.
810. The Gift of Knowledge, which like the other Gifts is had by all the just, must not be confused with sacred knowledge or theology, nor with the extraordinary gifts of infused knowledge and the charism of knowledge.
(a) The Gift of Knowledge resembles theology in that it reproduces objectively what reason does when it argues from the visible world to the invisible Creator; but, while subjectively theology is the result of study in which one passes successively from premise to conclusion. Knowledge is the result of a divine light that may be found even in the illiterate, and it takes in at a glance all that is contained in a process of argumentation. Through this Gift the wonders of nature, the events of history, the arguments of philosophy, lead one firmly and spontaneously to the Last End and the supernatural realities of faith.
(b) Infused knowledge may have for its object things purely natural (such as truths of philosophy and the ability to speak foreign languages), while the Gift of Knowledge is concerned only with faith, judging what is to be believed or done according to faith.