Now faith is the substance of things hoped for, the evidence of things not seen. On the senses in which the word ὑπόστασις (translated "substance") may be used, see under Hebrews 1:2. As to the sense intended here, views differ. There are three possible ones, expressed in the text and margin of the A.V., substance, ground, and confidence. The first is understood by the Fathers generally, the idea being supposed to be that, inasmuch as things not yet experienced, but only hoped for, become real to us by faith, faith is metaphysically their substance, as substantiating them to us. So Theophilus: οὐσίωσις τῶν μήπω ὄντων ὑπόστασις τῶν μὴ ὑφεστηκότων: and Chrysostom, who illustrates thus: "The resurrection has not yet taken place, but faith substantiates ( ὑφίστησιν) it in our souls." So also Dante, following St. Thomas Aquinas, in a striking passage quoted by Delitzsch ('Paradise,' 24.70-75)—
"Le profonde cose
Che mi largiscon qui la lor parvenza
Agli occhi di laggiu son si nascose,
Che l'esser lore ve in sola credenza,
Sovra la qual si fondu Palta spene:
E pero di sustanza prende Fintenza."
"The things profound
That here vouch safe to me their apparition
From all eyes here below are so concealed
That all their being is in faith alone,
Upon the which high hope doth base itself:
And therefore faith assumes the place of substance."
The rendering ground, which involves only the simpler idea of faith being the foundation on which hope is built, has not much support from the use of the word elsewhere, nor does it seem suitable here. For it is not the things hoped for, but rather our hopes of them that are grounded on our faith. The subjective sense, confidence, or assurance, is most in favor with modern commentators, principally as being the most usual one (cf. Hebrews 3:14; 2 Corinthians 9:4; 2 Corinthians 11:17; also Psalms 38:11, ἡ ὑπόστασις μου παρὰ σοῦ ἔστιν: Ezekiel 19:5, ἀπώλετο ἡ ὑπόστασις αὐτῆς: Ruth 1:12, ἔστι μοι ὑπόστασις τοῦ γενεθῆναι με ἀνδρί). One objection to this sense of the word here is that it is usually followed, when so intended, by a genitive of rite person, not of the thing; though Ruth 1:12 is an instance to the contrary. But apart from this consideration, the consensus of the Greek Fathers is a weighty argument for the retention of the rendering of the A.V. Either rendering, be it observed, gives the same essential meaning, though under different mental conceptions. Faith is further said to be the evidence of things not seen; ἔλεγχος meaning, not as some take it, inward conviction of their existence, but in itself a demonstration, serving the purpose of argument to induce conviction. So Dante, in continuation of the passage quoted above—
"E da questa credenza ci conviene
Sillogizar senza avere ultra visa;
E pero intenza d'argomento tiene."
"And from this credence it is fit and right
To syllogize, though other sight be none:
Therefore faith holds the place of argument."
Is this meant as a definition of faith, or only a description of its effect and operation, with especial regard to the subject in hand? Virtually a definition, though not in the strict logical form of one. At any rate, "the constituents and essential characteristics of faith are here laid down" (Delitzsch); i.e. of faith in its most general sense—that of belief in such things, whether past, present, or future, as are not known by experience, and cannot be logically demonstrated. "Licet quidam dicant praedicta apostoli verba non esse fidei definitionem, quia definitio indicat rei quidditatem et essentiam, tamen si quis recte consideret, omnia ex quibus fides potest definiri in praedicta descriptione tanguntur, licet verba non ordinentur sub forma definitionis" (St. Thomas Aquinas, 'Secunda Secundae,' qu. 4, art. 1). Faith, in the general sense indicated, is and has ever been, as the chapter goes on to show, the very root and inspiring principle of all true religion. And be it observed that, if well grounded, it is not irrational; it would rather be irrational to disregard it, or suppose it opposed to reason. Even in ordinary affairs of life, and in science too, men act, and must act, to a great extent on faith; it is essential for success, and certainly for all great achievements—faith in the testimony and authority of others whom we can trust, faith in views and principles not yet verified by our own experience, faith in the expected outcome of right proceeding, faith with respect to a thousand things which we take on trust, and so make ventures, on the ground, not of positive proof, but of more or less assured conviction. Religious faith is the same principle, though exercised in a higher sphere; and it may be as well grounded as any on which irreligious men are acting daily. Various feelings and considerations may conspire to induce it: the very phenomena of the visible universe, which, though themselves objects of sense, speak to the soul of a Divinity beyond them; still more, conscience, recognized as a Divine voice within us, and implying a Power above us to whom we are responsible; then all our strange yearnings after ideals not yet realized, our innate sense that righteousness ought to triumph over iniquity, as in our disordered world it does not yet;—which things are in themselves prophetic; and, in addition to all this, the general human belief in Deity. And when, further, a revelation has been given, its answering to our already felt needs and aspirations, together with the usual considerations on which we give credence to testimony, induces faith in it also, and in the things by it revealed; natural faith is thus confirmed, and faith in other verities is borne in upon the soul; which is further itself confirmed by experience of the effects of entertaining it. In some minds, as is well known, and these of the highest order, such faith may amount to certitude, rendering the "things unseen" more real to them than "the things that do appear." It cannot be said that to accept such faith as evidence is contrary to reason; our not doing so would be to put aside as meaning nothing the deepest, the most spiritual, the most elevating faculties of our mysterious nature, by means of which, no less than by our other faculties, we are constituted so as to apprehend the truth. And we may observe, lastly, that even to those who have not themselves this "fullness of faith," its very existence in others, including so many of the great and good, may surely be rationally accepted as evidence of realities corresponding to it.