We have collectively written 105 pages of text about those four lines: what I am writing here has certainly been written before in this thread.
Lines 2 and 3 appear to be Latin and they include crosses, while lines 1 and 4 appear to be German, without crosses. Something similar can be seen in other manuscripts, e.g. Buitzruss's notebook You are not allowed to view links.
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"rax pax fax ++++ in christo +" with
"marix + morix + vix + abia + maria +". When the text is separated by crosses, it typically is a charm and it is not grammatical language but a mix of Latin words, pseudo-Latin and holy names like Jesus, Maria, Adonai etc. (See You are not allowed to view links.
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Login to view. and following pages, e.g. this probably pseudo-Latin parallel for You are not allowed to view links.
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The Voynich manuscript has been studied by a number of professional palaeographers and manuscript experts (e.g. Richard Salomon, Hellmut Lehmann-Haupt, Jennifer M. Rampling, Lisa Fagin Davis). In my opinion, if lines 2 and 3 were plain Latin, they would have been translated by those scholars. Personally, I feel rather sure that lines 2 and 3 are not grammatical Latin.
For the "German" lines 1 and 4, there is some hope that they are actual language, since there are no crosses and at least Salomon believed he could read a bit of the bottom line which makes sense grammatically (so nim geismi[l]ch).
Also, the first word "poxleber" is You are not allowed to view links.
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But the first two words of line 4 are written in Voynichese, so recovering the whole meaning (if any) of that line is not just a matter of making sense of a few German words. Also, nobody has been able to make fully sense of line 1. It's normal that some characters are hard to read, usually grammar helps solve those problems: here that has not happened so maybe the German is not grammatical as well. My feeling is that grammatical / ungrammatical are about equally likely for the two "German" lines.