The least said, the soonest mended.
(or Least said, soonest mended) 少说为佳。
There was no trace of fingerprints, but the inspector found a dirty red bundle that contained jewellery which the old lady said was not hers.
巡官没有发现指纹,却发现了一个装有珠宝的、肮脏的红包袱。老妇人说那不是她的。