All is grist that comes to the mill

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The proverb "all is grist to the mill" means "everything can be made useful, or be a source of profit."

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An early figurative use of phrase is found in Arthur Golding’s translation of The Sermons of J. Calvin upon Deuteronomie, 1583: “There is no lykelihoode that those thinges will bring gryst to the mill.”