知恵の輪
the puzzle-ring
to rack one's brains―ransack one's brains―beat one's brains―cudgel one's brains―fillip one's wits―tax one's ingenuity draw on one's resources
智慧がつく
to grow wiser―grow in wisdom―cut one'wisdom-teech―(子どもなら)―grow in intelligence
a Bodhisattva that controls wisdom called 'Monjubosatsu'