Heidelberg Catechism, Lord's Day 19
Lord's Day 19 of the Heidelberg Catechism addresses the believer's gratitude and the work of the Holy Spirit in sanctification as a response to justification in Christ. This catechetical exposition serves as a foundational teaching tool for understanding the connection between faith and the transformed Christian life within the Reformed tradition.
[Lord's Day 19 text - parse manually from https://www.crcna.org/welcome/beliefs/confessions/heidelberg-catechism]