Belgic Confession (1561)
Article 29: The Marks of the True Church
We believe that we ought to discern diligently and very carefully, by the Word of God, what is the true church—for all sects in the world today claim for themselves the name of “the church.”
We are not speaking here of the company of hypocrites who are mixed among the good in the church and who nonetheless are not part of it, even though they are physically there.
But we are speaking of distinguishing the body and fellowship of the true church from all sects that call themselves “the church.”
The true church can be recognized if it has the following marks: The church engages in the pure preaching of the gospel; it makes use of the pure administration of the sacraments as Christ instituted them; it practices church discipline for correcting faults. In short, it governs itself according to the pure Word of God, rejecting all things contrary to it and holding Jesus Christ as the only Head. By these marks one can be assured of recognizing the true church—and no one ought to be separated from it.
As for those who can belong to the church, we can recognize them by the distinguishing marks of Christians: namely by faith, and by their fleeing from sin and pursuing righteousness, once they have received the one and only Savior, Jesus Christ.
They love the true God and their neighbors, They love the true God and their neighbors, without turning to the right or left, and they crucify the flesh and its works.
Though great weakness remains in them, they fight against it by the Spirit all the days of their lives, appealing constantly to the blood, suffering, death, and obedience of the Lord Jesus, in whom they have forgiveness of their sins, through faith in him.
As for the false church, it assigns more authority to itself and its ordinances than to the Word of God; it does not want to subject itself to the yoke of Christ; it does not administer the sacraments as Christ commanded in his Word; it rather adds to them or subtracts from them as it pleases; it bases itself on men, more than on Jesus Christ; it persecutes those who live holy lives according to the Word of God and who rebuke it for its faults, greed, and idolatry.
These two churches are easy to recognize and thus to distinguish from each other.
The Sufficiency of Scripture
We believe that this Holy Scripture contains the will of God completely and that everything one must believe to be saved is sufficiently taught in it. For since the entire manner of service which God requires of us is described in it at great length, no one — even an apostle or an angel from heaven, as Paul says — 2 ought to teach other than what the Holy Scriptures have already taught us. For since it is forbidden to add to or subtract from the Word of God, 3 this plainly demonstrates that the teaching is perfect and complete in all respects.
Therefore we must not consider human writings — no matter how holy their authors may have been — equal to the divine writings; nor may we put custom, nor the majority, nor age, nor the passage of time or persons, nor councils, decrees, or official decisions above the truth of God, for truth is above everything else.
For all human beings are liars by nature and more vain than vanity itself.
Therefore we reject with all our hearts everything that does not agree with this infallible rule, as we are taught to do by the apostles when they say, “Test the spirits to see if they are of God,” and also, “If anyone comes to you and does not bring this teaching, do not receive him into your house.” Gal. 1:8; Deut. 12:32; Rev. 22:18-19; 1 John 4:1; 2 John 1:10
Q. 29. What are the punishments of sin in the world to come?
A. The punishments of sin in the world to come, are everlasting separation from the comfortable presence of God, and most grievous torments in soul and body, without intermission, in hell-fire forever.
Q. 30. Doth God leave all mankind to perish in the estate of sin and misery?
A. God doth not leave all men to perish in the estate of sin and misery, into which they fell by the breach of the first covenant, commonly called the covenant of works; but of his mere love and mercy delivereth his elect out of it, and bringeth them into an estate of salvation by the second covenant, commonly called the covenant of grace.
Q. 31. With whom was the covenant of grace made?
A. The covenant of grace was made with Christ as the second Adam, and in him with all the elect as his seed.
Q. 32. How is the grace of God manifested in the second covenant?
A. The grace of God is manifested in the second covenant, in that he freely provideth and offereth to sinners a mediator, and life and salvation by him; and requiring faith as the condition to interest them in him, promiseth and giveth his Holy Spirit to all his elect, to work in them that faith, with all other saving graces; and to enable them unto all holy obedience, as the evidence of the truth of their faith and thankfulness to God, and as the way which he hath appointed them to salvation.
A. First, we must from the heart call upon the one true God only, who has revealed Himself in His Word, for all that He has commanded us to pray. Second, we must thoroughly know our need and misery, so that we may humble ourselves before God. Third, we must rest on this firm foundation that, although we do not deserve it, God will certainly hear our prayer for the sake of Christ our Lord, as He has promised us in His Word.
 Ps. 145:18-20; John 4:22-24; Rom. 8:26, 27; James 1:5; I John 5:14, 15; Rev. 19:10.  II Chron. 7:14; 20:12; Ps. 2:11; 34:18; 62:8; Is. 66:2; Rev. 4.  Dan. 9:17-19; Matt. 7:8; John 14:13, 14; 16:23; Rom. 10:13; James 1:6.
27. Q. What do you understand by the providence of God?
A. God’s providence is His almighty and ever present power, whereby, as with His hand, He still upholds heaven and earth and all creatures, and so governs them that leaf and blade, rain and drought, fruitful and barren years, food and drink, health and sickness, riches and poverty, indeed, all things, come not by chance but by His fatherly hand.