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The devil is in the details

Even the grandest project depends on the success of the smallest components.

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Note

This version of the proverb often implies that the details might cause failure. A more positive version is “God is in the details,” a saying often attributed to the architect Le Corbusier.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.