What is strange or unusual about Santiago's dream in Coelho's The Alchemist?

Santiago goes
to a gypsy woman for help with interpreting a dream that he has had twice. He learns for the
first time of a couple of terms that he learns more about later: the Language of God and the
Language of the Soul. She tells him that if God speaks to them in their language, she can do a
better job with interpreting those than when God speaks to the soul. 

Santiago then tells her that his dream involves him watching a child play with his
herd...