과유불급이 · 과유불급을
too much is as bad as too little; moderation is best
Example
운동도 과유불급이니까 너무 무리하지 마세요.
Even exercise can be overdone, so don't push yourself too hard.
Word parts
과 excess+유 like+불 not+급 reach
Literally 'going too far is like falling short'; a saying attributed to Confucius.
Related words