指做事要适度one should do things in moderation; one should not do the same thing more than three times in a row

• 俗话说事不过三，凡事经过三次相同经历后，就进入了最后阶段。

  As the proverb says, "one should not do the same thing more than three times in a row". After one has three identical experiences doing the same thing, one has entered the final stage.