How do we enter the interior castle? The interior castle is the soul itself. We have to enter into ourselves. We are seeking the One who dwells at the centre of the soul. We seek Our Lord in our souls by prayer, by paying attention to the One inside ourselves and his activities.
But how did St Teresa gain this insight to see the soul as a crystal mansion with many mansions? God gave her this gift as a charismatic grace. May God show himself to us. May he show us our capacity for a living relationship with God.