Work/who do no ...

Hi

An author of a book about self-improvement writes:

The teaching of people how to meet life so as to come

triumphantly through all its experiences is the most important part of our

work. There are very few doctors who do no appreciate this part of our

work, for they know that if a patient can rest, relax, let go and be

peaceful in time of trouble, at the same time hopeful and positive in

mind and thought that such will recover quickly and be none the worse

for the experience, and thus be saved from being attacked by any of the

many diseases that man is liable to, when his powers of resistance,

from any cause, have become lowered.

Does by "work" he mean a "book" this book? So he says that the teachings of (other) people how to meet life are the most important part of this book?

I assume that "who do no appreciate" means the same as "who do NOT appreciate"? So it means that most doctors appreciate this part of the book but there are a few who do not?

EDIt: I think that the author is teaching his readers, not someone else as I wrote it above.