病从口入，祸从口出 Disease goes in by the mouth and trouble comes out of the mouth. 解释： Illness comes in via the mouth because of food and trouble goes out via the mouth because of words.
Illness finds its way in by the mouth, calamity from mouth
Illness comes from food and trouble from speech.
A close mouth catches no flies 病从口入 A man may dig his grave with his teeth 祸从口出
