How does Paulo Coelho use imagery in By the River Piedra I Sat Down and Wept?

Imagery:

“Love is like a narcotic. At first it brings the euphoria of complete surrender. The next day, you want more."

It may arrive in the instant when we are doing something mundane, like putting our front-door key in the lock; it may lie hidden in the quiet that follows the lunch hour or in the thousand and one things that all seem the same to us. But that moment exists--a moment when all the power of the stars becomes a part of us and enables us to perform miracles.”