Say one thing and do another. (来源：专业英语学习网站 http://www.EnglishCN.com)
6. 一言既出，驷马难追：有人译成：One word lets slip and four horses will fail to catch it. 或 A statement that once let loose cannot be caught by four galloping horses.
A word once let go cannot be recalled.
You can not take back what you have said. (你说出的话，就不能再收回来。)
7. 祸从口出，言多必失：有人译为：The mouth is the gate of misfortune and evil.
Careless talk leads to trouble. (不小心说话，会带来麻烦); 或
The less said the better. (说的愈少愈好)
Shut the mouth and open the eyes. (闭嘴少说，张眼多看。) 摘自：旺旺英语