from the Catholic Encyclopedia:
Definition of faith
The foregoing analyses will enable us to define an act of Divine supernatural faith as "the act of the intellect assenting to a Divine truth owing to the movement of the will, which is itself moved by the grace of God" (St. Thomas, II-II, Q. iv, a. 2). And just as the light of faith is a gift supernaturally bestowed upon the understanding, so also this Divine grace moving the will is, as its name implies, an equally supernatural and an absolutely gratuitous gift. Neither gift is due to previous study neither of them can be acquired by human efforts, but "Ask and ye shall receive."
From all that has been said two most important corollaries follow:
That temptations against faith are natural and inevitable and are in no sense contrary to faith, "since", says St. Thomas, "the assent of the intellect in faith is due to the will, and since the object to which the intellect thus assents is not its own proper object — for that is actual vision of an intelligible object — it follows that the intellect's attitude towards that object is not one of tranquillity, on the contrary it thinks and inquires about those things it believes, all the while that it assents to them unhesitatingly; for as far as it itself is concerned the intellect is not satisfied" (De Ver., xiv, 1).
(b) It also follows from the above that an act of supernatural faith is meritorious, since it proceeds from the will moved by Divine grace or charity, and thus has all the essential constituents of a meritorious act (cf. II-II, Q. ii, a. 9). This enables us to understand St. James's words when he says, "The devils also believe and tremble" (ii, 19) . "It is not willingly that they assent", says St. Thomas, "but they are compelled thereto by the evidence of those signs which prove that what believers assent to is true, though even those proofs do not make the truths of faith so evident as to afford what is termed vision of them" (De Ver., xiv 9, ad 4); nor is their faith Divine, but merely philosophical and natural.
Some may fancy the foregoing analyses superfluous, and may think that they savour too much of Scholasticism. But if anyone will be at the pains to compare the teaching of the Fathers, of the Scholastics, and of the divines of the Anglican Church in the seventeenth and eighteenth centuries, with that of the non-Catholic theologians of today, he will find that the Scholastics merely put into shape what the Fathers taught, and that the great English divines owe their solidity and genuine worth to their vast patristic knowledge and their strictly logical training.
Let anyone who doubts this statement compare Bishop Butler's Analogy of Religion, chaps. v, vi, with the paper on "Faith" contributed to Lux Mundi. The writer of this latter paper tells us that "faith is an elemental energy of the soul", "a tentative probation", that "its primary note will be trust", and finally that "in response to the demand for definition, it can only reiterate: "Faith is faith. Believing is just believing'". Nowhere is there any analysis of terms, nowhere any distinction between the relative parts played by the intellect and the will; and we feel that those who read the paper must have risen from its perusal with the feeling that they had been wandering through — we use the writer's own expression — "a juggling maze of words."
