And thereby makes clear in 4 words what the whole story was about. In a 60's or 70's era anthology I think. I’ve always remembered it as being an example of good or clever writing. I've never read another story with the same effect. If I gave any more clues it would spoil the story. I only read it once yet I can still remember it… but what was the story?
EDIT: The aliens were hiding some important information on the human race and the hero spent the whole story trying to find out what it was.