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.
The view that priests mediate between God and the people and that grace flows through their office. Rejected by the Reformation doctrine of the priesthood of all believers.
In Doctrine — What Lutherans teach, and where it differs from neighbouring traditions.