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On: every psalm and song in the daily prayers uses today’s English. Off: all of them use the older “thee and thou”. Until you choose, the Songs of Zechariah, Mary and Simeon use today’s English, as most churches sing them. The Lord’s Prayer and the prayers for the dying show the form most people learned.
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The Formula of Concord's teaching that God's law serves a third purpose beyond restraining evil in society and revealing sin: guiding the Christian life, showing believers what a life of gratitude to God looks like.
In Doctrine — What Lutherans teach, and where it differs from neighbouring traditions.
