君子一言,駟馬難追 [ㄐㄩㄣ ㄗˇ ㄧ ㄧㄢˊ , ㄙˋ ㄇㄚˇ ㄋㄢˊ ㄓㄨㄟ; jun1 zi3 yi1 yan2 , si4 ma3 nan2 zhui1] a nobleman's word is his bond (proverb) ◄ ►