The Heidelberg Catechism
Lord's Day 13
Q&A 33
Q: Why is he called God's "only Son"
when we also are God's children?
A: Because Christ alone is the eternal, natural Son of God.1
We, however, are adopted children of God-
adopted by grace through Christ.2
1 John 1:1-3, 14, 18; Heb. 1
2 John 1:12; Rom. 8:14-17; Eph. 1:5-6
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