Drawn up at Amsterdam, the 27th of September, 1627, called “_Scriptural Instruction_,” concerning who the people are, on whom the peace of God rests, and how they are bound to peace and unity; given in answer to the following several questions, of which the first is:
_What are the fundamental and unmistakable marks by which the children of God and members of Jesus Christ (being the church of God) can and must be known, according to the testimony of the word of the Lord?_
In order to answer this question correctly, we must consider what the means are, by which men become children of God, members of Jesus Christ, and the church of God. For although the blessed Lord Jesus Christ is the only meritorious cause of the justification of man, their adoption by God as his children, and the foundation of their eternal salvation (Rom. 3:24,25; 1 Cor. 1:30; Tit. 3:7; Heb. 5:12; Eph. 1:5; Col. 3:11; Acts 4:12); God, the heavenly Father, of whom all things are, 1 Cor. 8:6; and who is the true Father of the whole family in heaven and earth, Eph. 3:14,15, has nevertheless been pleased to impute the merits of his Son Jesus Christ to man, and make him partaker of the same, through the means of faith in his beloved, only, and only begotten Son (Rom. 3:25; Gal. 2:16; Eph. 2:8; John 3:15,36; 6:40); whereby he owns them as children, and adopts them as heirs of everlasting life, according to the testimony of John, who says: “He” (that is, Christ) “came unto his own, and his own received him not. But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name: which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.” John 1:11–13. Paul confirms this with these words: “Ye are all the children of God by faith in Christ Jesus.” Gal. 3:26. Through this means--faith--apprehended from the word of God, and confirmed by the Holy Spirit, men are born of God; hence, the appellation, _children of God_, truly belongs to them, since they have God for their father, and Christ for their brother. God the Father acknowledges them as his sons and daughters; and Christ, for this reason, is not ashamed to call them his brethren. (Rom. 10:17; 2 Cor. 4:13; Rom. 8:16; John 1:12; 1 John 5:1; James 2:18; 1 Pet. 1:23; Matt. 5:45; John 1:12,13; 3:2; 20:17; Rom. 8:15; Gal. 4:6; Matt. 12:50; 2 Cor. 6:18; Heb. 2:11,12). These children of God and brethren of Jesus Christ, are heirs of God, yea, joint heirs in the inheritance of their brother Jesus Christ, as has been promised to them by God the Father, through the means of faith, all the acquired benefits of our Savior Jesus Christ, which are, chiefly: forgiveness of sins, justification, and peace with God; and, because they are children of the resurrection, they shall not come into condemnation, but are passed from death unto life; they shall enjoy salvation, eternal life, and unspeakable happiness, yea, possess all things that the Lord Christ possesses. Rom. 8:17; Eph. 1:11; John 7:3; Acts 10:43; Rom. 3:26; 4:5; 5:1; Gal. 2:16; Luke 20:26; John 5:24; Matt. 16:16,17; Mark 16:16; Rom. 10:9; 1 Pet. 1:9; John 3:16; 6:47; 17:3; 20:31; 1 John 5:11; 1 Pet. 1:8; Luke 22; Rev. 21:7.
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.