Martin Luther: The human heart is like a millstone in a mill: when you put wheat under it, it…

The human heart is like a millstone in a mill: when you put wheat under it, it turns and grinds and bruises the wheat to flour; if you put no wheat, it still grinds on, but then 'tis itself it grinds and wears away.

In today’s wordsThe human heart is like a millstone: put wheat under it and it turns and grinds and crushes the wheat to flour; put nothing under it and it still grinds, but then it grinds and wears away itself.