http://en.wikipedia.org/wiki/The_Gateless_Gate
But this section is marked with "This article possibly contains original research."Although the short title The Gateless Gate has become fairly common in English, this translation must be rejected upon closer scrutiny. A particular source of criticism is the fact that in the rendering, "Gateless Gate", the word "gate" occurs twice. However, the two Chinese characters being translated here are 門 (mén) and 關 (guān), which are different words and usually have distinct meanings. In order to more accurately reflect this, the translations The Gateless Passage, The Gateless Barrier or The Gateless Checkpoint are used.
The character 無 (wú) has a fairly straightforward meaning: no, not, or without. However, within Chinese Mahayana Buddhism, the term 無 (wú) is often a synonym for 空 (sunyata). This implies that the 無 (wú) rather than negating the gate (as in "gateless") is specifying it, and hence refers to the "Gate of Emptiness". This is consistent with the Chinese Buddhist notion that the "Gate of Emptiness" 空門 is basically a synonym for Buddhism, or Buddhist practice. ...
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