Hmm..
It's written by a 15th century monk, mostly as advice to other monks (i.e. he uses phrases such as "You have entered the monestary in order to find your God"). The thesis statememnt, if i may use the term, is a basic Christian ideal:
"My son, to the degree that you can leave yourself behind, to that degree you shall be able to enter into Me."
have to go now. I'll talk more later.