The least said, the soonest mended.
(or Least said, soonest mended) 少说为佳。
We often read in novels how a seemingly respectable person or family has some terrible secret which has been concealed from strangers for years.
在小说中,我们经常读到一个表面上受人尊重的人物或家庭,却有着某种多年不为人所知的骇人听闻的秘密。