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Heidelberg Catechism

Lord's Day 12

Q. 32. But why art thou called a Christian?

A. Because I am a member of Christ by faith, and thus am partaker of his anointing; that so I may confess his name, and present myself a living sacrifice of thankfulness to him: and also that with a free and good conscience I may fight against sin and Satan in this life and afterwards I reign with him eternally, over all creatures.