The Heidelberg Catechism: Lord's Day 7

20. Questions: Are all men, then, saved by Christ just as they perished through
Adam?

Answer: No. Only those are saved who by a true faith are grafted into Christ and accept all His benefits.[1]

[1] Matt. 7:14; John 1:12; 3:16, 18, 36; Rom. 11:16-21.

21. Question: What is true faith?

Answer: True faith is a sure knowledge whereby I accept as true all that God has revealed to us in His Word.[1] At the same time it is a firm confidence[2] that not only to others, but also to me,[3] God has granted forgiveness of sins, everlasting righteousness, and salvation,[4] out of mere grace, only for the sake of Christ's merits.[5] This faith the Holy Spirit works in my heart by the gospel.[6]

[1] John 17:3, 17; Heb. 11:1-3; James 2:19. [2] Rom. 4:18-21; 5:1; 10:10; Heb. 4:16. [3] Gal. 2:20. [4] Rom. 1:17; Heb. 10:10. [5] Rom.3:20-26; Gal. 2:16; Eph. 2:8-10. [6] Acts 16:14; Rom. 1:16; 10:17; I Cor. 1:21.

22. Question: What, then, must a Christian believe?

Answer: All that is promised us in the gospel, [1] which the articles of our catholic and undoubted Christian faith teach us in a summary.

[1] Matt. 28:19; John 20:30, 31.

23. Question: What are these articles?

Answer: III.1.I believe in God the Father almighty, III.1. Creator of heaven and earth. III.2.I believe in Jesus Christ, III.2.His only begotten Son, our Lord; III.3.He was conceived by the Holy Spirit, III.3.born of the virgin Mary; III.4.suffered under Pontius Pilate, III.4.was crucified, dead, and buried; III.4.He descended into hell; III.5.On the third day He arose from the dead; III.6.He ascended into heaven, III.6.and sits at the right hand III.6.of God the Father almighty; III.7.from there He will come to judge III.7.the living and the dead. III.8.I believe in the Holy Spirit; III.9.I believe a holy catholic Christian church, III.9.the communion of saints; III.10.the forgiveness of sins; III.11.the resurrection of the body; III.12.and the life everlasting.

The Heidelberg Catechism: Lord's Day 6

16. Question: Why must He be a true and righteous man?

Answer: He must be a true man because the justice of God requires that the same human nature which has sinned should pay for sin.[1] He must be a righteous man because one who himself is a sinner cannot pay for others.[2]

[1] Rom: 5:12, 15; I Cor. 15:21; Heb. 2:14-16. [2] Heb. 7:26, 27; I Pet. 3:18.

17. Question: Why must He at the same time be true God?

Answer: He must be true God so that by the power of His divine nature[1] He might bear in His human nature the
burden of God's wrath,[2] and might obtain for us and restore to us righteousness and life.[3]

[1] Is. 9:5. [2] Deut. 4:24; Nah. 1:6; Ps. 130:3. [3] Is. 53:5, 11; John 3:16; II Cor. 5:21.

18. Question: But who is that Mediator who at the same time is true God and a true and righteous man?

Answer: Our Lord Jesus Christ,[1] whom God made our wisdom, our righteousness and sanctification and redemption (I Corinthians 1:30).

[1] Matt. 1:21-23; Luke 2:11; I Tim. 2:5; 3:16.

19. Question: From where do you know this?

Answer: From the holy gospel, which God Himself first revealed in Paradise.[1] Later, He had it proclaimed by the patriarchs[2] and prophets,[3] and foreshadowed by the sacrifices and other ceremonies of the law.[4] Finally, He had it fulfilled through His only Son.[5]

[1] Gen. 3:15. [2] Gen. 12:3; 22:18; 49:10. [3] Is. 53; Jer. 23:5, 6; Mic. 7:18-20; Acts 10:43; Heb. 1:1. [4] Lev. 1:7; John 5:46; Heb. 10:1-10. [5] Rom. 10:4; Gal. 4:4, 5; Col. 2:17.