What does the idiom in this text suggest?
"Speak of the devil!" Candice declared when Johnny strolled into the room.

 - Candice had just been speaking about Johnny.
 - Candice thought Johnny was a troublemaker.
The text uses an idiom, an expression that cannot be understood literally.
The idiom speak of the devil suggests that Candice had just been speaking about Johnny. People say this when the person they've just been speaking about coincidentally arrives, as if summoned.