BINGO now we’re cooking with gas !!!
That’s beautiful, and to think I worked it out on my own dime. 
Quoting the first paragraph, I went to GPT to find the source, got loads of info, including:
3. What your quoted passage really is
That paragraph you brought is almost certainly from:
- A modern philosophy essay
- A textbook
- Or a lecture-style explanation
It’s stitching together:
- Plato’s cave (accurately summarized)
- Nietzsche’s critique (loosely paraphrased across multiple works)
Bottom line
- The quote is not traceable to a single Nietzsche text
- It’s a secondary interpretation of his anti-Platonic philosophy
- The real sources behind it are:
- Plato → Republic, Book VII
- Nietzsche → On Truth and Lies, Beyond Good and Evil, and related works
Interesting how it got all of that out of only the first paragraph.
Regarding
You could have slid this in to your comment over there, if you wanted to point out that I’ve said nothing new, {except of course, I understand the modern science that supports my case, lightyears beyond what Nietzsche could have known about our evolved-biological body.}
Which I don’t think is a trivial distinction.
Also, I wonder why that statement and sentiment is so obscure, when what he’s saying is so important to a sober adult understanding of our human condition, … as opposed to melodramatic philosophical idealizations (such as the contrived Hard Problem) that does more salve our sensitive human ego, rather than offering some solid understanding.
It deserves being loudly and explicitly discussed !