Beryl Fox, a Canadian film maker.

Estrella Alfon

No, this quote is not from Agatha Christie. It is a variation of the proverb "The mills of the gods grind slowly, but they grind exceedingly fine," which has been attributed to various sources throughout history.

Greek philosopher Sextus Empiricus

The words are quoted thus: "Though the mills of God grind slowly, yet they grind exceedingly small; Though with patience He stands waiting, with exactness grinds He all." It is attributed to Freiher (Baron) Friedrich von Logau, a German epigramist (poet of epigrams) from the early to mid 17th century. It is from his collection of Sinngedichte (Sense Poems) titled Retribution. It is also attributed to Welsh poet George Herbert's Jacula Prudentum, "God's mill grind slow, but sure,"