You have to separate the chaff from the wheat

Don't throw away the wheat with the chaff

It's hard to figure out how to separate the wheat from the chaff.

As you get older, you find that often the wheat, disentangling itself from the chaff, comes out to meet you

Newspaper editors are men who separate the wheat from the chaff, and then print the chaff.

Editor: a person employed by a newspaper, whose business it is to separate the wheat from the chaff, and to see that the chaff is printed.