Is there an proverb or saying in English for '叶公好龙'? I do think that '叶公好龙’ is very image, and very vividly for describing someone who is faking passion, and is a very common word, are there any English one for '叶公好龙'?
葉公好龍 http://www.epochtimes.com/b5/3/11/2/n404356.htm
從這個故事演變的成語“葉公好龍”常用來比喻人說一套，做一套，口是心非

In English, it is similar to &quot; talk the talk, but not walk the walk' meaning someone's words doesn't match his action' (說一套，做一套)