The Devil is in the Details
"The devil is in the details" is an idiom alluding to a catch or mysterious element hidden in the details;[1|1] it indicates that "something may seem simple, but in fact the details are complicated and likely to cause problems".[2|2] It comes from the earlier phrase "God is in the details", expressing the idea that whatever one does should be done thoroughly; that is, details are important.[1|1]
The source of the proverb ‘The devil is in the details’ is often attributed to the German/American architect Ludwig Mies Van Der Rohe. This is almost certainly a misattribution. The expression derives from an earlier German proverb - “Der liebe Gott steckt im detail”, which translates as ‘God is in the detail’.
This well‑known idiom cautions us that seemingly minor aspects of something, especially plans or projects, can harbor hidden problems. It suggests that thoroughness and attention to detail are crucial because even small oversights can lead to significant issues. Essentially, it is a reminder that complexity often resides within the specifics, and overlooking them can be detrimental.
I really like the duality of it's modern vs original wordage. It tells how we perceive challenges that come with a project. We can either see them as a savior "God" or as a hinderance "Devil" to the overall success of a goal.