法门 
法门[-門] fǎmén* n. ①〈hist.〉 south gate ②〈Budd.〉 door to enlightenment ③correct way to accomplish sth.
不二法门 不二法门 [bù'èrfǎmén] the one and only way; the only proper course to take 
不 不 negative / - / nail person drop negative 二 二 two / - / one two 法 法 method / - / water gone method 門 门 gates / - / single gate gates