Take it with a grain of salt.

If you 'take something with a grain of salt,' it means that you consider the source while deciding if something is true or not.

Examples:

-Sara didn't like the movie.  She said it was awful.

-yeah, but you have to take everything she says with a grain of salt.  She doesn't like most movies.

-The newspaper said the economy is sinking.

-It could be true, but you have to take it with a grain of salt.  That newspaper isn't very reliable.

He took another opportunity.

Saying that someone "took another opportunity" is a way of saying someone no longer works in a place. Since it is a vague response, there is no way to know if the person quit or was fired.

-Does Michael still work here?
-No, he took another opportunity.
-Oh, that's too bad! I really liked him!
-Yeah, we miss him, too.