知白守黑zhī bái shǒu hēiknow sth very well but keep silent
❍ 知其白，守其黑，为天下式。(《老子》二十八章) He who knows the white glory and yet keeps to the black humility,|Becomes the model for the world. 知白守黑zhī bái shǒu hēi守：固守。形容心里明白，但表面上装出没有看见的样子。know and observe all but stay obscure, know sth. very well but keep silent |