The Heidelberg Catechism: Lord’s Day 2
3.Question: From where do you know your sins and misery?
Answer: From the law of God.
 Rom. 3: 20;
4. Question: What does God’s law require of us?
Answer: Christ teaches us this in a summary in Matthew 22: You shall love the LORD your God with all your heart, and with all your soul, and with all your mind. This is the great and first commandment. And a second is like it, You shall love your neighbor as yourself. On these two commandments depend all the law and the prophets.
 Deut. 6:5.  Lev. 19:18.
5. Question: Can you keep all this perfectly?
Answer: No, I am inclined by nature to hate God and my neighbor.
 Rom. 3:10, 23; I John 1:8, 10.  Gen. 6:5; 8:21; Jer. 17:9; Rom. 7:23; 8:7; Eph. 2:3; Tit. 3:3.
The Heidelberg Catechism: Lord’s Day 51
Question 126: What does the fifth request mean?
Answer: Forgive us our debts, as we also have forgiven our debtors means, Because of Christ’s blood, do not hold against us, poor sinners that we are, any of the sins we do or the evil that constantly clings to us. 
Forgive us just as we are fully determined, as evidence of your grace in us, to forgive our neighbors. 
 Ps. 51:1-7; 143:2; Rom. 8:1; 1 John 2:1-2;  Matt. 6:14-15; 18:21-35
The Heidelberg Catechism: Lord’s Day 50
125. Question: What is the fourth petition?
Answer: Give us this day our daily bread. That is: Provide us with all our bodily needs so that we may acknowledge that Thou art the only fountain of all good, and that our care and labor, and also Thy gifts, cannot do us any good without Thy blessing. Grant therefore that we may withdraw our trust from all creatures, and place it only in Thee.
 Ps. 104:27-30; 145:15, 16; Matt. 6:25-34.  Acts 14:17; 17:25; James 1:17.  Deut. 8:3; Ps. 37:16; 127:1, 2; I Cor. 15:58.  Ps. 55:22; 62; 146; Jer. 17:5-8; Heb. 13:5, 6.
The Heidelberg Catechism: Lord’s Day 49
124. Question: What is the third petition?
Answer: Thy will be done, on earth as it is in heaven. That is: Grant that we and all men may deny our own will, and without any murmuring obey Thy will, for it alone is good. Grant also that everyone may carry out the duties of his office and calling as willingly and faithfully as the angels in heaven.
 Matt. 7:21; 16:24-26; Luke 22:42; Rom. 12:1, 2; Tit. 2:11, 12.  I Cor. 7:17-24; Eph. 6:5-9.  Ps. 103:20, 21.
The Heidelberg Catechism: Lord’s Day 48
123. Question: What is the second petition?
Answer: Thy kingdom come. That is: So rule us by Thy Word and Spirit that more and more we submit to Thee. Preserve and increase Thy church. Destroy the works of the devil, every power that raises itself against Thee, and every conspiracy against Thy holy Word. Do all this until the fullness of Thy kingdom comes, wherein Thou shalt be all in all.
 Ps. 119:5, 105; 143:10; Matt. 6:33.  Ps. 51:18; 122:6-9; Matt. 16:18; Acts 2:42-47.  Rom. 16:20; I John 3:8.  Rom. 8:22, 23; I Cor. 15:28; Rev. 22: 17, 20.
The Heidelberg Catechism: Lord’s Day 47
122. Question: What is the first petition?
Answer: Hallowed be Thy Name. That is: Grant us first of all that we may rightly know Thee, and sanctify, glorify, and praise Thee in all Thy works, in which shine forth Thy almighty power, wisdom, goodness, righteousness, mercy, and truth. Grant us also that we may so direct our whole life– our thoughts, words, and actions– that Thy Name is not blasphemed because of us but always honored and praised.
 Jer. 9:23, 24; 31: 33, 34; Matt. 16:17; John 17:3.  Ex. 34:5-8; Ps. 145; Jer. 32:16-20; Luke 1:46-55, 68-75; Rom. 11: 33-36.  Ps. 115:1; Matt. 5:16.
The Heidelberg Catechism: Lord’s Day 46
120. Question: Why has Christ commanded us to address God as Our Father?
Answer: To awaken in us at the very beginning of our prayer that childlike reverence and trust toward God which should be basic to our prayer: God has become our Father through Christ and will much less deny us what we ask of Him in faith than our fathers would refuse us earthly things.
 Matt. 7:9-11; Luke 11:11-13.
121. Question: Why the words “in heaven”?
Answer: These words teach us not to think of God’s heavenly majesty as something earthly,  and to expect everything for body and soul from his almighty power.
 Jer. 23:23-24; Acts 17:24-25  Matt. 6:25-34; Rom. 8:31-32