轻薄的嘴唇含着一千个谎言
[qīng bó de zuĭ chún hán zhe yī qiān gè huăng yán]
This translates as 'Thin Lips Conceal A Thousand Lies', expressing an ironic sentiment. It describes someone who appears sincere or honest but hides lies under pleasant-sounding words. This may suggest they have learned not to fully trust others or even themselves as appearances can be misleading.