"A word to the wise is enough." 意思是聪明人一句话就够了。这句话的来源可以追溯到古希腊哲学家赫拉克勒特斯（Heracptus）的著作《Fragments》中。
例句：
A word to the wise is enough, so I won't say more about it. (聪明人一句话就够了，所以我不会再说了。)
I think a word to the wise is enough, you should know what I mean. (我认为聪明人一句话就够了，你应该知道我的意思。)