What does “speak of the devil” mean?

people say speak / talk of the devil when sb they have been talking about appears unexpectedly

How is “speak of the devil” used?

In The Dark Knight Rises (2012), one line is: “-Where is that masked--? BANE: Speak of the devil...”

The clip at the top of this page is from The Dark Knight Rises (2012).

-Where is that masked--? BANE: Speak of the devil...

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