Keep your smile.All will be better.
Two wrongs do not make a right.别人错了，不等于你对了。
The water that bears the boat is the same that swallows it up.
水能载舟，亦能覆舟。
The wise man knows he knows nothing, the fool thinks he knows all.清者自清，浊者自浊。
Talk of the devil and he will appear.说曹操，曹操就到。