take sth as gospel

to "accept/take something as gospel (truth)" means to believe that something is completely true.

Eg.You shouldn't accept as gospel everything you read in the newspapers.

be on cloud nine (非常開心)

"be on cloud nine" means to be very happy.

 

Eg. For a few days after I heard I'd got the job, I was on cloud nine.

Every cloud has a silver lining. 塞翁失馬，焉知非福

"Every cloud has a silver lining." -----something that you say which means that there is something good even in an unpleasant situation.  Eg.As the trip's been cancelled I'll be able to go to the match this Saturday. Every cloud has a silver lining.