How about "No one knows ..."?
As in "No one knows everything from the outset"? I think that's a valid translation
Yes. Could you add it as an alternative translation then?
Or, if you think the current translation doesn't sound natural enough, you could simply replace it with the one I suggested.
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追加:Chromatic, 2014年1月9日
リンク:Chromatic, 2014年1月9日