On your way to becoming what you want to be or in hopes of acquiring what you want, you will encounter difficulties in life. It is a part of your life and it's what we have to accept. Everybody is in their own battlefield, in their own levels and anyone who wishes to win it must never retreat. The shepherd in the book is "us" and the ventures of the shepherd is a metaphor of our life.
P.S: Omens are not always superstitions.