Hence, we reply, in conclusion to the question presented: That the fundamental, certain mark of the children of God and members of Jesus Christ, is that by virtue of which this appellation belongs to them in truth according to the promise of God, namely, the only saving faith which worketh by love; upon which God himself looks with gracious eyes, and which alone avails before him (Gal. 5:6; Jer. 5:3; Hos. 2:2; Jer. 5:1; Acts 8:37; 15:11; Is. 26:2) wherefore we, being one or unanimous with God, must have respect to it alone, seeing that the Lord Christ himself, promising Peter salvation upon his faith and confession, adds: “Thou art Peter, and upon this rock I will build my church; and the gates of hell shall not prevail against it.” Matt. 16:18.
We shall now briefly show, what faith in Christ is, what is to be believed, what its design is, and what are the internal and external operations of faith.
This faith in Christ, by which men become partakers of all the acquired benefits of Jesus Christ, is neither an uncertain opinion nor merely a bare confession of the mouth, but a firm and sure confidence of the heart, which doubts not the things promised by God in Christ; but has a firm assurance that he who has promised them is able also to perform them. Heb. 11:13; 3:6; Rom. 10:10; 4:20,21. By this firm and sure confidence the believer in the promises of God is established in Jesus Christ his Savior, because he knows that all the promises of God are yea and amen in him; on which he lays firm hold, as on an anchor of his soul, both sure and steadfast. Acts 10:43; 1 Pet. 1:10,11; John 8:56; Heb. 11:26; 2 Cor. 1:20; Heb. 6:18,19. He believes with his heart that God,—for the fulfilling of his gracious promises, willing to show his great love toward mankind who, through sin, had fallen into death and manifold corruptions, by redeeming them,—sent into this world for this purpose, when the time of all prophecies was fulfilled, his only, dear and beloved Son, who from eternity was with his Father in great glory and beloved by him before the foundation of the world, possessing great riches and being equal with God his Father, by whom all things were made, and without whom not anything was made of all that was made in heaven or upon earth, and in whom they all stand, since he upholds all things by the word of his power. Gen. 22:18; Deut. 8:15; Is. 7:15; 9:6; 11:1; 40:9; Micah 5:2; John 3:16; Rom. 5:8; 9:31; 1 John 4:9,10; Gen. 3:19; Wis. 2:24; 4 Esdr. 7:48; Rom. 4:5,12; 1 Cor. 15:21; Rom. 5:16; 4 Esdr. 3:7; Gen. 3:17; Rom. 1:2; 8:3; Col. 1:13; Eph. 1:7; Gal. 4:4; Mark 12:6; 1:11; Matt. 17:5; 3:17; Heb. 1:8; 7:3; 13:8; 1:3; John 16:28; 17:5,24; 2 Cor. 8:9; Phil. 2:6; Rev. 1:18.
He left his divine glory, form, and riches, went out from God, his Father, and came down from heaven into this world, so that he was conceived by a virgin, and she brought forth this Son at Bethlehem, where God brings his first-born Son into the world in the likeness of sinful flesh. John 13:3; 3:13,31; 6:38,51,62; Eph. 4:9,10; Is. 7:14; Matt. 1:23; Luke 2:21; Is. 9:6; Luke 3:6; Gal. 4:4; Micah 5:2; Matt. 2:6; Heb. 1:6; Rom. 8:3. For the Word became flesh; that which was from the beginning, which the apostles saw, which they heard with their ears, and which their hands handled, of the Word of life; for the life was manifested, so that there was seen that eternal life, which was with the Father. John 1:14; 1 John 1:1,2; John 1:9; 20:25,27; Is. 40:5,9. Therefore, all true believers must show and ascribe to their Savior, not as to a creature, but as to the Creator, all divine honor, even as they do unto the Father. John 5:23; 3:30,31; 20:28. For, although, for a little while, he was made lower than the angels, yet all the angels of God must worship him. Phil. 2:10; Matt. 14:33; Heb. 1:6; For he is worthy of this who hath so loved us that he purchased us with his death, and washed us from our sins in his own blood; who died for our sins and rose for our justification; who destroyed the power of the devil, hell, and death; who abolished the sinful hand-writing of the law, and has forgiven all sins, reconciling to God the Father all things that are in heaven and earth, in that he made peace through the blood of his cross; who brought life and immortality to light, and unto whom we are appointed by God, to inherit eternal salvation. Rev. 5:9; 1:5; Rom. 5:10; Acts 20:28; Col. 1:14; 1 Pet. 1:19; Rom. 4:25; 5:6,8; Col. 2:13,14,19,20; Heb. 2:14; 1 Cor. 15:54,55; Rev. 20:14; Is. 25:8; 2 Tim. 1:10; Eph. 1:10; 2:13; 1 Thess. 5:9.
Thus the Lord Jesus Christ, the Son of the living God, is the true corner-stone, the way and door to eternal life, and there is no other name given unto man, either in heaven or on earth, whereby he can be saved, and become a child or heir of God, than the name of our Lord Jesus Christ. Is. 28:16; Rom. 9:33; Eph. 2:20; 1 Pet. 2:6; John 14:6; 10:9; Acts 4:12.
The believer, seeing, by faith, that God in his weightiest and unspeakably great promises is not mutable, but does, in truth, fulfill them through the giving of his only, dear, and beloved Son, feels assured by this, that there is nothing with God, which he shall not also give us with his Son. He, therefore, has firm confidence, that the benefits which God has promised in and through the suffering, death, shed blood, resurrection and ascension of his Son, belong to the believer, and that he shall in truth receive them. Heb. 6:17,18; Ps. 33:4; John 3:16; 1 John 4:9; Eph. 1:6; Col. 1:12–14; 2 Tim. 4:8; Eph. 1:11–13; Rom. 8:32,34,38; 2 Pet. 1:3; Gal. 2:21; Eph. 2:17; 2 Cor. 4:6,7.
This faith begets in the heart of the believer an inward taste of the kindness of God, and of the powers of the world to come; which is followed by gladness, joy, and a firm security of the Father’s favor in the soul, whereby, in every time of need, he is enabled to say, confident that he will be heard, “Abba, Father;” and doubts not, though the thing promised be not apparent to human eyes, nay, seem contrary to nature, and transcends the comprehension, understanding and capability of man (Ps. 34:8; 1 Pet. 2:3; Eph. 2:7; Heb. 6:5,19; 2 Cor. 4:17; Rom. 12:12; 14:17; 2 Cor. 6:10; John 8:56; Rev. 19:7; Rom. 8:31,38; Ps. 32:1; 1 Pet. 5:7; Ps. 55:22; Rom. 8:15; Gal. 4:6; Rom. 4:20; James 1:6; Heb. 11:1; Rom. 4:18,19; Heb. 11:11; Heb. 11:29), for the believer, by faith, looks not only at the things which, through the creation and government of God, exist in nature (which man may comprehend and understand), but to the goodness and omnipotence of the Promiser, unto whom nature and all creatural power in heaven, earth and sea, nay, death itself, must bow. Upon this ground the believer stands fast, even when, with Abraham, the father of the faithful, and with many of the pious, he is tried of God by things seemingly contradictory; for he is assured that God cannot lie. Ps. 52:9; Rom. 4:21; Heb. 11:19; Ps. 135:5; Is. 40:26; 4 Esdr. 3:21,23; Josh. 10:13; Heb. 3:10,11; Matt. 27:44; Is. 40:12; Rev. 20:11; Prov. 8:29; Jer. 5:22; Ex. 14:22; Heb. 11:10,35; 2 Cor. 1:10; Gen. 22:1; 1 Pet. 1:7.
But this faith of the heart is known the very best unto God, who also, being the only discerner of the intents and thoughts of the heart, will judge the internal signs of the faith of the heart, according as he finds it to be upright or dissembling. Jer. 17:10; Acts 1:24; Rev. 2:23; Heb. 4:12. But to man, who has no other way of judging this faith of the heart, than by the fruits of the same, which he hears and sees, there are given as signs by which to distinguish it, the confession of it with the mouth, and the obedience of faith as manifested in outward works. Therefore the believer, according to the command of Christ, must confess openly before men, to the honor of his Creator and Redeemer, what he believes and experiences in his heart, no matter, what sufferings may result to him on that account. He can not do otherwise, for he must hearken unto God more than unto men (Mark 16:16; John 3:36; 1 Cor. 2:11; John 3:11; Rom. 10:10; 1:5,16,25; Acts 4:19,20); for the Lord Christ hath said: “Whosoever therefore shall confess me before men, him will I confess also before my Father which is in heaven.” Matt. 10:32; Luke 9:26. John says: “Every spirit that confesseth that Jesus Christ is come in the flesh is of God.” 1 John 4:2, and Paul explains: “We having the same spirit of faith, according as it is written, I believed, and therefore have I spoken;[44] we also believe, and therefore speak.” 2 Cor. 4:13.
That, therefore, oral confession proceeding from sincere faith conduces to salvation, Paul testifies with these words: “If thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved. For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.” Rom. 10:9,10.
This faith exhibits also its outward fruits of love worthy of the faith; wherefore the believer, according to the teaching of the apostle Peter, must give all diligence to show forth from his faith, virtue, knowledge, temperance, patience, godliness, brotherly love, and charity; and walk in the Spirit, whose fruits, as love, joy, peace, long suffering, gentleness, goodness, faith, meekness, temperance, are seen on them outwardly. 2 Pet. 1:5–7; Gal. 5:16,22,23; 6:1; Eph. 5:9. By these good fruits, and by brotherly love, as external signs of the true faith, they are known as good trees, the salt of the earth, the light of the world, a light which is put on a candlestick, to give light unto all that are in the house, a city set on a hill which cannot be hid. And thus they let their good works so shine before men, that they, seeing them, may glorify God, the heavenly Father. Matt. 7:17,20; 12:35; 5:13–16.