Heidelberg Catechism · Lord's Day 25
66. What are the sacraments?
Answer
The sacraments are visible, holy signs and seals. They were instituted by God so that by their use he might the more fully declare and seal to us the promise of the gospel, namely, that because of the one sacrifice of Christ accomplished on the cross, he graciously grants us the forgiveness of sins and eternal life.
Scripture references
Question 66 of 129
Study it, question by question
Bosko turns the catechism into a few minutes a day — one question at a time, spaced so the answers actually stick, with an AI companion grounded in the Reformed tradition to talk through whatever you don't yet grasp.