Luther on Preaching

"A sincere preacher must consider the young people, the servants and maids in the church, those who lack education. He must accommodate himself to them as a nursing mother does to her infant. She prattles with the child and nurses it at her breast, since it needs no wine or malvasia. So preachers should also act; they should be simple in their sermons. But when they come to me, to Philipp, or to Pomeranus, they may let us hear how leaned they are; then they may be exposed. But to spout Greek, Hebrew, and Latin in sermons in order to have admiring people praise them is conceit and is out of place."