Thanks a lot for the additional information.
I am now sure the following is the case: your ring depicts the coat of arms of the family
Lindenau.
I could verify the blason being (roughly translated) "Party per fess, silver top, green bottom, a tilia with green leaves and silver trunk, surrounded by 3 red roses in the lower field, the roses 2:1.".
The German original reads "Geteilt von Silber und Grün, darin eine grün belaubte Linde mit silbernem Stamm, um den Stamm im unteren Feld 3 rote Rosen (2:1)".
The family von Lindenau had 3 branches, of which the latest vanished in 1842, as Prof. Mielke and Mrs. Franz point out in their interesting works to be found
here. They have also many depictions of the coat of arms,
here would be another one.
Mannheim University kindly provides us with the 1717 edition of Philipp Jakob Spener's work you quoted:
link.
The page in question can be seen
here again. The hatching there also supports the colours of the blason from the other sources I found.
You also showed the coat of arms with the branch instead of the tree I mentioned earlier (the only "von der Linde" arms I could find so far).
Now I still have the problem of seeing a connection between the "von der Linde" family and the "Lindenau" family. Maybe your research and information can shed a light there?
Plus, the original question of the allegedly married partner is still unanswered. But as we now probably know the real source, the genealogical research could be easier. I could also write to Prof. Mielke if you want to.