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Phrase(s): The mills of God grind slowly, yet they grind exceeding small.
Prov. It may take a long time, but evil will always be punished. • Jill: It really doesn’t seem right that Fred can be so horrible and dishonest, but he always gets everything he wants. Jane: Be patient. The mills of God grind slowly, yet they grind exceeding small.
McGrawhill's American Idioms And Phrasal Verbs