It were better for him that a millstone were hanged about his neck, and he cast into the sea. - Bible
I swore that I would not suffer from the world's grief and the world's stupidity and cruelty and injustice and I made my heart as hard in endurance as the nether millstone and my mind as a polished surface of steel. I no longer suffered, but enjoyment had passed away from me. - Sri Aurobindo
Wadsworth MoorWhere the millstone of skyGrinds light and shadow so purple-fineAnd has ground it so longGrinding the skin off the earthEarth bleeds her raw true darknessA land naked now as a woundThat the sun swabs and dabsWhere the miles of agony are numbnessAnd harebell and heather a euphoria - Ted Hughes