The officer in charge of the royal pew in the chapel at Windsor, England, noted that King George VI frequently commented on the sermon as he left the church. If he had been blessed by it, he would say in a cheerful voice, "That will do very well. That will feed souls!".
When the preacher's delivery was cold and his words were lifeless and barren of Gospel teaching, he would shake his head sorrowfully as he left the pew and mutter under his breath, "That won't do. That just won't feed souls!".
The king's criterion for determining the value of a sermon is scripturally sound. Ministry of all kinds, whether oral or written, may well be judged by the same standard -- does it feed souls?