The early Christians compared the human mind to a constantly grinding millstone; it is up to the miller to determine what it will grind: good wheat or worthless weeds. Our minds are always grinding, but it is up to us to choose what to feed them.

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Attribution

Quote text and notes from Wikiquote: Martin Dada Abejide Olorunmolu (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.