Baptism and the Lord’s Supper in the Heidelberg Catechism

Lord’s Days 25 through 30 treat the sacraments — baptism and the Lord’s Supper. The Reformed understanding that emerges is carefully distinct from both the Roman Catholic view and the purely memorialist view common in evangelical Protestantism.

Signs and Seals

Q. 66 defines sacraments as ‘holy, visible signs and seals, instituted of God for this end, that by their use He may the more fully declare and seal to us the promise of the gospel.’ The word ‘seal’ is important: a sacrament is not merely a visible reminder but an official confirmation — an attestation that the gospel promise is yours.

Baptism and Infant Membership

The catechism connects the water of baptism to the blood and Spirit of Christ. Q. 74 defends infant baptism: since infants belong to God’s covenant and are members of His church, they ought to receive the sign of the covenant — just as circumcision was given to covenant infants under the old administration.

The Lord’s Supper as Spiritual Nourishment

Q. 75 uses the language of eating and drinking as a metaphor for the spiritual reality: just as bread and wine nourish the body, Christ’s body and blood nourish the soul. The Reformed position is that Christ is truly present at the table, spiritually — the believer’s heart is lifted up to heaven by faith to receive what the sign promises.