Comment by Ptyx

It's a quote I read in German translated here via DeepL with slight changes. Seems like it is part of this work from 1851:

https://en.wikipedia.org/wiki/For_Self-Examination

From this chapter:

http://gutenberg.spiegel.de/buch/zur-selbstprufung-der-gegen...

Couldn't immediately find an English version of the text.