冰炭不言，冷热自明 bīng tàn bù yán ， lěng rè zì míng

DEFINITIONS

  1. ice or coals, whether hot or cold goes without saying (idiom); fig. sincerity is not expressed in words

CHARACTERS

冰 bīng
HSK 3
ice; ice-cold
炭 tàn
HSK 5
charcoal; coal; carbon
不 bù
HSK 1
no, not; un-; negative prefix
言 yán
HSK 4
words, speech; speak, say
冷 lěng
HSK 1
cold, cool; lonely
热 rè
HSK 1
hot; heat; fever; restless; zeal
自 zì
HSK 3
self, private, personal; from
明 míng
HSK 1
bright, light, brilliant; clear