ㄕㄨshūㄅㄨˋㄐㄧㄣˋjìnㄧㄢˊyán

  1. 易經·繫辭》:書不盡言言不盡意。』」內心意思文字完全表達三國演義·》:書不盡言。」

I have much more to say than can be written in this letter (conventional letter ending)​ (idiom)​