It were better for him that a millstone were hanged about his neck, and he cast into the sea.

New Testament: Luke xvii. 2.

  Hard as a piece of the nether millstone.

Old Testament: Job xli. 24.

  Your eyes are so sharpe that you cannot onely looke through a Milstone, but cleane through the minde.

John Lyly (Circa 1553-1601): Euphues and his England, page 289.

  You can see farther into a millstone than he.

Miguel De Cervantes (1547-1616): Don Quixote. Part ii. Chap. xxviii.