是的，应该改为：Facts speak louder than words.  

相关表达：

Facts speak louder than words. 事实胜于雄辩。

Facts are more eloquent than words. 事实胜于雄辩。

Actions speak louder than words. 行动胜于语言。

Deeds are better than words when people are in need of help. 当有人需要帮助的时候，行动胜于言语。