So I do wish I could in fact remember more about the specific contents, thematics and organisational set-up of Helmut Göbel's Lessings Nathan: Der Autor, der Text, seine Umwelt, seine Folgen other than that Göbel’s text is most definitely an informative, enlightening and academically critical analysis and interpretation of Lessing's Nathan der Weise (Nathan the Wise).
And yes, Lessings Nathan: Der Autor, der Text, seine Umwelt, seine Folgen, it was strongly recommended to me by our professor when we were reading Lessing's classic for a graduate level German Enlightenment drama course at university (and I do truly very much believe that my intense perusal of Helmut Göbel's text really did help me to not only better understand Nathan as a character, it also was a if not actually the main reason why I managed to get an A on both my oral presentation on the play and on the midterm exam, which indeed focused very heavily on Nathan der Weise). Highly recommended (but with the necessary caveat that a good and at least high intermediate fluency in German is most definitely required, although Lessings Nathan: Der Autor, der Text, seine Umwelt, seine Folgen is thankfully and happily also not as annoyingly complicated and convoluted as many other such interpretive tomes sometimes and rather far too often tend to be).
And yes, if I ever do manage to obtain a personal copy of Lessings Nathan: Der Autor, der Text, sene Umwelt, seine Folgen (as the copy I read was actually a University of Waterloo library book), I will also and hopefully strive to reread and offer a more detailed, a more substantial review. For sorry, but I just do not remember all that much about the actual contents of Lessings Nathan: Der Autor, der Text, seine Umwelt, seine Folgen except that it was an engagingly enlightening and much productive reading experience for me, and hence a very nostalgic and likely also somewhat majorly biased five star rating (and I am also and even actively trying to NOT purchase n particular too many academic books at present, as I simply do not have ANY more either shelf or even floor space and room available for them, and well, Lessings Nathan: Der Autor, der Text, seine Umwelt, seine Folgen is also and unfortunately long out of print, and thus not really all that readily available, and indeed quite ridiculously and prohibitively expensive the last time I checked online).