Small details are often the most important or problematic.
細部にこそ重要な点や問題が潜んでいる。 (saibu ni koso juyona ten ya mondai ga hisondeiru)
"The overall concept was great, but the devil is in the details."
"全体の構想は良かったが、細部に悪魔が潜んでいる。" (zentai no kosou wa yokatta ga saibu ni akuma ga hisondeiru)
not very intelligent; not a genius
to express an idea clearly so that others understand it
to plan a new direction or strategy
a group of experts developing new ideas or policies
difficulty trusting others due to past experiences
Any big task starts with a small action.