Well, I have finally finished the book, and the following passage felt quite pertinent to me:
"Nature provides every kind of spectacle for our eyes. We say that she is full of surprises, forgetting that those things which strike us as rare or novel have always existed and are by no means new though we may never have noticed them. Perhaps Nature's aim in presenting herself to us in such different guises in various places is to persuade us not to be satisfied with a limited point of view; she is, that is to say, silently urging us to enlarge our minds."
I agree with that.