「小学英语谚语」A wise man thinks all that he says; a fool says all that he thinks．聪明人想了才说；愚笨人想着就说。

A wise man thinks all that he says; a fool says all that he thinks．聪明人想了才说；愚笨人想着就说。

此谚语两个并列分句是很好的对偶句：wise man对fool，thinks与says都相对，意思是将要说的话先经过思考，不应讲的就不讲，这才是聪明人；相反，将心里所想的话都讲出来了，不管该不该讲，就是愚笨人。

还有一些意思相同的谚语，也是对偶句：

Wise men have their mouth in their heart; fools, their heart in their mouth.（句中fools后省略了have）

聪明人嘴在心里；愚笨人嘴在心外。

Keep your mouth shut and your ears open；keep your mouth shut and your eyes open．

多听少讲，多看少讲。

近似意思的谚语还有：

First think, then speak．

先想后讲。

Think today, and speak tomorrow．

三思而后言。

相关意思的谚语还可参阅：Speech is silver, silence is golden.及：He knows much who knows how to hold his tongue.