Isaac Watts traces a line of divine promise from Abraham to the early church, showing how God’s covenant with families changed in form but not in character. The speaker’s voice is steady and grateful — a believer looking back at Scripture and seeing a pattern of grace. There’s no argumentative edge here; instead, the mood is quietly confident, almost tender. The poem moves through key moments: God’s pledge to Abraham, the shift from circumcision (sealed with blood) to baptism (sealed with water), then the household conversions of Lydia and a Philippian jailer. Each example reinforces the idea that faith flows down through families. When Watts says “later saints” bring their infants to God, he’s inviting his own congregation into that ancient story. The feeling is one of humble trust — parents simply claiming what has been offered. The hymn wraps generations together in a calm, enduring hope.
Hymn 121 — Summary
Children devoted to God. [For those who practise infant Baptism.]
Gen. 17:7,10; Acts 16:14,15,33.
Thus saith the mercy of the Lord, "I'll be a God to thee; I'll bless thy num'rous race, and they Shall be a seed for me."
Abram believed the promised grace, And gave his sons to God; But water seals the blessing now, That once was sealed with blood.
Thus Lydia sanctified her house, When she received the word; Thus the believing jailer gave His household to the Lord.
Thus later saints, eternal King! Thine ancient truth embrace; To thee their infant offspring bring, And humbly claim the grace.