This is how St.Teresa described the Castle in her wonderful book so many years ago:
"I began to think of the soul as if it were a castle made of a single diamond or of very clear crystal, in which there were many rooms, just as in Heaven there are many mansions."
"These mansions are not arranged in a row one behind another but variously - some above, others below and others at each side; and in the center and midst of them all is the chiefest mansion, where the most secret things pass between God and the soul."
Now, the first room or mansion, according to St. Teresa, was the Mansion of Humility. "Souls in the First Mansion are in a state of grace, but are very much in love with the venomous creatures outside the castle - that as, with occasions of sin - and need a long and searching discipline before they can make any progress." ...."the heat and light from within reach them only in a faint and diffused form, all is cold and dim."