noun:  one of a pair of heavy flat disk-shaped stones that are rotated against one another to grind the grain
noun:  any load that is difficult to carry
noun:  (figurative) something that hinders or handicaps

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Cayce
"Failure to anyone should be as a stepping stone and not as a millstone." [Cayce 931-1]

"It is the "try" that is the more often counted as righteousness, and not the success or failure. Failure to anyone should be as a stepping stone and not as a millstone." [Cayce 931-1]