This writing on the wall can be traced back to Aurelius Augustinus (354-430) and has been created using free software exclusively (The GIMP).
It reads:
Omnis enim res, quae dando non deficit, dum habetur et non datur, nondum habetur, quomodo habenda est.
Quoted from Aurelius Augustinus (4th century)
Source: Sigisbert Mitterer, "Bibliothek der Kirchenväter", Vol.
49, München 1925
In English this means: "For if a thing is not diminished by being shared with others, it is not rightly owned if it is only owned and not shared."
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