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.
Luther's younger colleague at Wittenberg and the author of the Augsburg Confession and its Apology. The systematiser of the Reformation, temperamentally more conciliatory than Luther.
In History — The Reformation, and the people who carried it.