冰炭不言，冷熱自明 [ㄅㄧㄥ ㄊㄢˋ ㄅㄨˋ ㄧㄢˊ , ㄌㄥˇ ㄖㄜˋ ㄗˋ ㄇㄧㄥˊ; bing1 tan4 bu4 yan2 , leng3 re4 zi4 ming2] ice or coals, whether hot or cold goes without saying (idiom); fig. sincerity is not expressed in words ◄ ►
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