Most people have heard the expression, The Devil is in the Details. It is commonly thought to be a play on the idiom God is in the Details, which had been used to exemplify the works of celebrated artists, architects, and engineers. It suggests that great reward can be found when consideration is given to the smallest details.
Alternately, The Devil is in the Details suggests that situations or plans that seem sound should be carefully evaluated because even the smallest detail can cause major problems if neglected. It is meant as a caution to pay attention.
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