Heidelberg Catechism · Lord's Day 13
33. Why is he called God's only-begotten Son, since we also are children of God?
Answer
Because Christ alone is the eternal, natural Son of God. We, however, are children of God by adoption, through grace, for his sake.
Scripture references
John 1:1-3 · John 1:14 · John 1:18 · Romans 8:15-17 · Ephesians 1:5-6 · Galatians 4:4-7
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