Beware Of entrance to a quarrel, but being in, Bear't that th'opposed may beware of thee.

Beware Of entrance to a quarrel, but being in, Bear't that th'opposed may beware of thee.

你们要谨慎，免得入了争竞的口。但在争竞的时候，不可叫对面的人也谨慎。

-- William Shakespeare 威廉·莎士比亚