The balance between literature and philosophy in Schopenhauer and Nietzsche is different from that struck in the novella, but, as Mann clearly pointed out in his writings about both thinkers, both modes are present.

I would like to undermine the stereotype of "strict philosophy." J.L. Austin remarked that, when philosophy is done well, it's all over by the bottom of the first page. I take him to have meant that the real work comes in setting up the problem with which you are dealing, and thus getting your reader to take particular things for granted.

Schopenhauer's thought that Will is insatiable, that once satisfied in one form it must be expressed in new desires, is inherited both by Mann and by Aschenbach (it's in Mahler, as well). So life is inevitably incomplete.

I take the ethical truths to be the stable elements that emerge out of ethical progress and that are retained under further ethical progress.

A different vision of ethics is that of a collection of resources people can use to act better. The resources might be firm rules that could always be relied on. Or they might be ideals that could often be followed without thinking but that sometimes conflicted with one another.

One of the things I want to do in the book is to explore how philosophy can be done in literature. I start doing that in the first chapter, by introducing the idea of "philosophy by showing". What literature/philosophy shows is how to look at some important facets of life in a new way, thus changing the frame in which subsequent philosophical argument proceeds.

Sometimes, however, the new synthetic complex proves stable, and even serves as the beginning of a much larger cluster of attitudes that displace some we've previously considered to be fixed parts of ourselves.