Heidelberg Catechism, Lord's Day 32
Lord's Day 32 of the Heidelberg Catechism addresses the believer's gratitude and obedience as a response to salvation, emphasizing the necessity of good works and Christian conduct flowing from faith. This catechetical instruction provides both doctrinal foundation and practical guidance for the Christian life, making it essential material for understanding Reformed piety and ethics.
[Lord's Day 32 text - parse manually from https://www.crcna.org/welcome/beliefs/confessions/heidelberg-catechism]