This is one of the best pieces of writing in English I have ever read. While it doesn't completely qualify as a self-help book (it discusses mainly the philosophy of life), it is miles ahead anything available today.
You should sample the work of writers who take pride in the quality of their writing & ideas, not just the latest "100 tips to success in business" book.
So much of the writing we read is written by amateur writers who are professionals in some other realm.
I should probably offer suggestions, which is hard; but try this recent nonfiction essay by novelist & essayist Hilary Mantel:
These are both fiction-writers; I'm struggling to think of really high-quality non-fiction writing, but that's just because I haven't read any recently... An example, at least -- Christopher Hitchens covers some of the same territory as Richard Dawkins, but his writing is head & shoulders above.
