My Solution – Abbreviated Middle High German

[ReneZ]

Parchment must for (before) thoughtlessness it harmful far know entirely from bizeichen truth promising joke is 

That's not a sentence. To make sense of it, you have to interpret a lot into it—meanings for which you have no evidence—and that is precisely what constitutes classic eisegesis in its purest form.

It becomes even more clear once you put yourself not in the position of the interpreter of the text, but in the position of the person who composed it. 

According to the argument, he would have taken a long meaningful sentence, and not written that, but instead wrote: "Parchment must for (before) thoughtlessness it harmful far know entirely from bizeichen truth promising joke is"