Why is prayer necessary for Christians?

Because prayer is the most important part of the thankfulness which God requires of us. Moreover, God will give His grace and the Holy Spirit only to those who constantly and with heartfelt longing ask Him for these gifts and thank Him for them.

Scripture proofs King James Version

Ps. 50:14, 15 Offer unto God thanksgiving; and pay thy vows unto the most High: And call upon me in the day of trouble: I will deliver thee, and thou shalt glorify me.
Ps 116:12-19 What shall I render unto the LORD for all his benefits toward me? I will take the cup of salvation, and call upon the name of the LORD. I will pay my vows unto the LORD now in the presence of all his people. Precious in the sight of the LORD is the death of his saints. O LORD, truly I am thy servant; I am thy servant, and the son of thine handmaid: thou hast loosed my bonds. I will offer to thee the sacrifice of thanksgiving, and will call upon the name of the LORD. I will pay my vows unto the LORD now in the presence of all his people. In the courts of the LORD’s house, in the midst of thee, O Jerusalem. Praise ye the LORD.
I Thess. 5:16-18 Rejoice evermore. Pray without ceasing. In every thing give thanks: for this is the will of God in Christ Jesus concerning you.
Matt. 7:7, 8 Ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you: For every one that asketh receiveth; and he that seeketh findeth; and to him that knocketh it shall be opened.
Luke 11:9-13 And I say unto you, Ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you. For every one that asketh receiveth; and he that seeketh findeth; and to him that knocketh it shall be opened. If a son shall ask bread of any of you that is a father, will he give him a stone? or if he ask a fish, will he for a fish give him a serpent? Or if he shall ask an egg, will he offer him a scorpion? If ye then, being evil, know how to give good gifts unto your children: how much more shall your heavenly Father give the Holy Spirit to them that ask him?

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Edition & Source Public domain

Source: The Heidelberg Catechism
Translation: English translation as published by apuritansmind.com; Scripture proofs: King James Version
Published: First published 1563
Original URL: apuritansmind.com/creeds-and-confessions/the-heidelberg-catechism-by-zacharias-ursinus/
Copyright: Public domain.
License: Public domain
Attribution: Public domain. Text transcribed from apuritansmind.com, which reformed.org's historic-documents index links to. Compared automatically with the PDF at heidelberg-catechism.com, which is the same translation family: 217 of 258 questions and answers matched. Of the 41 that did not, I checked 18 by hand: Q12, Q18, Q27, Q56 and Q61 differ in wording, and the others were page-layout noise in the PDF; the remaining 23 were not checked by hand. Not yet proofread against a printed edition. Part divisions are the standard ones (Q1–2 introduction; Q3–11 misery; Q12–85 deliverance; Q86–129 thankfulness). The question 23 creed text had verse-number markers removed. Scripture proof texts are the King James Version, from the public-domain Project Gutenberg edition, added with tools/add_kjv.py. A few references could not be matched to verses (whole-chapter references such as ‘Genesis 1 throughout’, and typing slips in the source) and are shown without text.

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Cite as The Heidelberg Catechism. First published 1563. https://www.apuritansmind.com/creeds-and-confessions/the-heidelberg-catechism-by-zacharias-ursinus/