Identify the figure of speech in this sentence:

"Anyone who calls a spade a spade should be compelled to use one." --Oscar Wilde

Simile
Metaphor
Personification
Analogy
Hyperbole
None of these

I'm torn between personification and none of these, however I'm not entirely sure..

http://www.tnellen.com/cybereng/lit_terms/

Look up each term here, and let us know what you decide.