Which figure of speech is used in this text?
I can resist everything except temptation.
—Oscar Wilde, Lady Windermere's Fan

 - paradox
 - oxymoron
The text uses a paradox, a statement that might at first appear to be contradictory, but that may in fact contain some truth.
I can resist everything except temptation at first appears to be contradictory, as resisting something requires not giving in to temptation. However, it contains some truth: it's easy to resist doing things that are not tempting in the first place.