Why is "Your will be done" not redundant?

The question is about the words "Your will be done" (γενηθήτω τὸ θέλημά σου, [Matthew 6.10](http://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.01.0155%3Abook%3DMatthew%3Achapter%3D6%3Averse%3D10)) in the Lord's prayer. I do not understand the meaning of it. My faith tells me that *everything* happens according to the Lord's will anyway, so why pray asking for this to happen if I believe that this is the only thing that can ever happen in any circumstances anyway?